feat: add eslint npm scripts and convert eslintrc.js to eslintrc.json

[anshgoyalevil]

Description
This PR does the following things:

• Update eslint plugin
• Add lint:fix and lint:check npm scripts
• Convert .eslintrc.js to .eslintrc.json

Related issue(s)

This PR fixes #1639

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	22
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🔴 PWA	30

Lighthouse ran on https://deploy-preview-1647--asyncapi-website.netlify.app/

[anshgoyalevil]

@derberg I would suggest shifting from a separate configuration of eslint for every project to a separate plugin specially for AsyncAPI.

More like globalizing the rules across the organization.

I created a plugin for AsyncAPI projects. Could you please check if its appropriate? https://github.com/anshgoyalevil/eslint-config

Issue Link: asyncapi/community#238

[derberg]

@anshgoyalevil yeah, we should do that, we have too many copy/paste around the whole initiative. Of course some folks could do their own config, but if not, then they could use this package.

[anshgoyalevil]

@derberg Should we shift it under the @asyncapi/eslint-config npm package?

[derberg]

yeah, let's first try your package through your account and see it in action and then we can ask community to accept your project

[akshatnema]

@anshgoyalevil @derberg Closing this PR as we are moving with #1946.