[FSSDK-12880] Refactor project config creation

- Simplify createProjectConfig to accept a datafile string directly
  instead of string | object, inlining datafile validation
- Remove the separate config_validator module and its tests
- Break monolithic config builder into focused parse functions:
  parseAudienceConfig, parseAttributeConfig, parseGroupConfig,
  parseRolloutConfig, parseIntegrationConfig, parseExperimentConfig,
  parseFeatureFlagConfig
- Eliminate mutation-safe datafile copy in favor of direct construction
- Refactor redundant iterations over experiments and feature flags
- Remove lodash dev dependency

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: raju-opti

lib/core/bucketer/index.spec.ts

@@ -74,7 +74,7 @@ describe('excluding groups', () => {
     vi.clearAllMocks();
 
     setLogSpy(mockLogger);
-    configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+    configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
 
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
@@ -125,7 +125,7 @@ describe('including groups: random', () => {
     vi.clearAllMocks();
 
     setLogSpy(mockLogger);
-    configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+    configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     bucketerParams = {
@@ -231,7 +231,7 @@ describe('including groups: overlapping', () => {
     vi.clearAllMocks();
 
     setLogSpy(mockLogger);
-    configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+    configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     bucketerParams = {
@@ -276,7 +276,7 @@ describe('bucket value falls into empty traffic allocation ranges', () => {
 
   beforeEach(() => {
     setLogSpy(mockLogger);
-    configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+    configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     bucketerParams = {
@@ -326,7 +326,7 @@ describe('traffic allocation has invalid variation ids', () => {
 
   beforeEach(() => {
     setLogSpy(mockLogger);
-    configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+    configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     //@ts-ignore
     bucketerParams = {
@@ -369,7 +369,7 @@ describe('testBucketWithBucketingId', () => {
   let bucketerParams: BucketerParams;
 
   beforeEach(() => {
-    const configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+    const configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     bucketerParams = {

lib/core/bucketer/index.tests.js

@@ -65,7 +65,7 @@ describe('lib/core/bucketer', function () {
 
       describe('return values for bucketing (excluding groups)', function () {
         beforeEach(function () {
-          configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+          configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
           bucketerParams = {
             experimentId: configObj.experiments[0].id,
             experimentKey: configObj.experiments[0].key,
@@ -107,7 +107,7 @@ describe('lib/core/bucketer', function () {
       describe('return values for bucketing (including groups)', function () {
         var bucketerStub;
         beforeEach(function () {
-          configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+          configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
           bucketerParams = {
             experimentId: configObj.experiments[0].id,
             experimentKey: configObj.experiments[0].key,
@@ -255,7 +255,7 @@ describe('lib/core/bucketer', function () {
 
       describe('when the bucket value falls into empty traffic allocation ranges', function () {
         beforeEach(function () {
-          configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+          configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
           bucketerParams = {
             experimentId: configObj.experiments[0].id,
             experimentKey: configObj.experiments[0].key,
@@ -303,7 +303,7 @@ describe('lib/core/bucketer', function () {
 
       describe('when the traffic allocation has invalid variation ids', function () {
         beforeEach(function () {
-          configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+          configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
           bucketerParams = {
             experimentId: configObj.experiments[0].id,
             experimentKey: configObj.experiments[0].key,
@@ -364,7 +364,7 @@ describe('lib/core/bucketer', function () {
       });
 
       beforeEach(function () {
-        var configObj = projectConfig.createProjectConfig(cloneDeep(testData));
+        var configObj = projectConfig.createProjectConfig(JSON.stringify(testData));
         bucketerParams = {
           trafficAllocationConfig: configObj.experiments[0].trafficAllocation,
           variationIdMap: configObj.variationIdMap,