Revert "feat!: add 3.0.0 validation support (#208)"

[derberg]

This reverts commit 6300c37, reversing changes made to 8369438.

Unfortunately I merged #208 as merge and not squash and merge

[asyncapi-bot]

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 No release type found in pull request title "Revert "feat!: add 3.0.0 validation support (#208)"". Add a prefix to indicate what kind of release this pull request corresponds to. For reference, see https://www.conventionalcommits.org/

Available types:
 - feat: A new feature
 - fix: A bug fix
 - docs: Documentation only changes
 - style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
 - refactor: A code change that neither fixes a bug nor adds a feature
 - perf: A code change that improves performance
 - test: Adding missing tests or correcting existing tests
 - build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
 - ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
 - chore: Other changes that don't modify src or test files
 - revert: Reverts a previous commit

[sonarcloud]

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[fmvilas]

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