type-check mdx files, components, add narrow type to inline filter

[josefaidt]

Description of changes:

• mv data/platforms to constants/platforms
• refactor platforms constants
• refactor frameworks constants
• narrow type for InlineFilter's filters prop
• define types for MDX page props
• declare global types for MDX page props
• declare global types for MDX page components
• adds MDX files to tsconfig for type-checking
• enables MDX plugin to enable strict type-checking on MDX files

the completions can be a bit wonky in that they'll only show up if you have the corresponding closing tag, but it's a bit easier to tab through

Related GitHub issue #, if available:

Instructions

If this PR should not be merged upon approval for any reason, please submit as a DRAFT

Which product(s) are affected by this PR (if applicable)?

• amplify-cli
• amplify-ui
• amplify-studio
• amplify-hosting
• amplify-libraries

Which platform(s) are affected by this PR (if applicable)?

• JS
• Swift
• Android
• Flutter
• React Native

Please add the product(s)/platform(s) affected to the PR title

Checks

• Does this PR conform to the styleguide?

• Does this PR include filetypes other than markdown or images? Please add or update unit tests accordingly.

• Are any files being deleted with this PR? If so, have the needed redirects been created?

• Are all links in MDX files using the MDX link syntax rather than HTML link syntax?
  
  ref: MDX: [link](https://docs.amplify.aws/)
  HTML: <a href="https://docs.amplify.aws/">link</a>

When this PR is ready to merge, please check the box below

• Ready to merge

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.