DRAFT: Added new webhook-schema package

[maurafortino]

Includes:

• updated webhook-schema structs: RegistrationV1 and RegistrationV2
• updated the validation to use webhook-schema options and removed the duplicate validation functionality from ancla

currently using local repos

MRs that need to be merged before this can be merged:

• https://github.com/xmidt-org/argus/pull/748
• https://github.com/xmidt-org/webhook-schema/pull/16
• https://github.com/xmidt-org/webhook-schema/pull/30

[guardrails[bot]]

:warning: We detected 1 security issue in this pull request:

Vulnerable Libraries (1)

Severity | Details :-: | :-- Medium | [pkg:golang/github.com/aws/aws-sdk-go@v1.50.26](https://github.com/xmidt-org/ancla/blob/206234de9f2d4164a1d3b371a2534f2ed43e1545/go.sum#L78) - **no patch available** More info on how to fix Vulnerable Libraries in [Go](https://docs.guardrails.io/docs/en/vulnerabilities/go/using_vulnerable_libraries.html?utm_source=ghpr).

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[maurafortino]

Have a new PR for this based on the changes that were made to webhook-schema