add httpFilters field to targethttpproxy resource

[Dawid212]

This pr adds HttpFilters to TargetHttpProxy

compute: add `http_filters` field to `google_compute_target_http_proxy` resource

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@zli82016, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 4 files changed, 105 insertions(+))
google-beta provider: Diff ( 4 files changed, 105 insertions(+))
terraform-google-conversion: Diff ( 1 file changed, 10 insertions(+))
Open in Cloud Shell: Diff ( 1 file changed, 1 insertion(+))

[modular-magician]

Tests analytics

Total tests: 1318
Passed tests: 1233
Skipped tests: 84
Affected tests: 1

Click here to see the affected service packages

• compute

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccComputeFutureReservation_sharedFutureReservationExample

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[modular-magician]

🔴 Tests failed during RECORDING mode:
TestAccComputeFutureReservation_sharedFutureReservationExample [Error message] [Debug log]

🔴 Errors occurred during RECORDING mode. Please fix them to complete your PR.

View the build log or the debug log for each test

[zli82016]

Suggested change

	URLs to networkservices.HttpFilter resources enabled for xDS clients using this configuration.
	URLs to **networkservices.HttpFilter** resources enabled for xDS clients using this configuration.

[zli82016]

Suggested change

	loadBalancingScheme set to INTERNAL_SELF_MANAGED.
	**loadBalancingScheme** set to INTERNAL_SELF_MANAGED.

[zli82016]

Is api_name needed?