refactor: remove custom schema parsers

[magicmatatjahu]

Description

Remove OpenAPI, RamlDT and AVRO custom schema parsers - we will move them to the separate repos.

NOTE: This PR will be merged when we will move all parsers to repos and release them (as prerelease or new major release).

cc @smoya

Related issue(s)
Part of #481

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[jonaslagoni]

NOTE: This PR will be merged when we will move all parsers to repos and release them (as prerelease or new major release).

@magicmatatjahu do you mind converting it to draft if this should not be reviewed/merged as of yet?

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity 😴

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[smoya]

This is already done and merged by #756. this can be closed! @magicmatatjahu