feat non mandatory validation on gateway

[TejInaco]

This PR will introduce a new feature:

• Non-mandatory gateway validation: Users can now submit workflow contributions to the catalog without specifying gateway values in the Interaction

Also, will introduce refactoring in the structure, mainly:

• Refactored form components to maintain structural consistency, improve code organization and reused of subcomponents, decrease the DOM duplication
• Enhanced TypeScript type checking

Attention: BREAKING CHANGES
Closes #165

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[egekorkan]

It still doesn't work end to end, please test it end to end with http://plugfest.thingweb.io/http-data-schema-thing without the endpoint and turning @type into "tm:ThingModel". Now, the values are read but the generated TM does not have @type somehow?