feat: Add implementation for generating mock event from openapi schema

[hnnasit]

Issue number:
N/A

Summary

This PR adds implementation for loading OpenAPI schema using the go lib https://pkg.go.dev/github.com/getkin/kin-openapi/openapi3 and generating a skeleton mock event.

Changes

New file structure:

internal
│   └── pkg
│       ├── mock
│       │   └── event
│       │       ├── openapi.go
│       │       ├── openapi_test.go
│       │       ├── schemas.go
│       │       ├── schemas_test.go

openapi.go: contains a function to load the fetched schema and call a recursive function which generates the skeleton of the mock event
schemas.go: Contains the existing func to fetch schema from schema registry.

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[jysheng123]

Looks good to me