Add 'brotli' plugin

[into-the-v0id]

Description

Add plugin to compress files with brotli.

Uses https://deno.land/x/[email protected]

Related Issues

None

Check List

• Have you read the
  CODE OF CONDUCT
• Have you read the document
  CONTRIBUTING
  • One pull request per feature. If you want to do more than one thing,
    send multiple pull request.
  • Write tests.
  • Run deno fmt to fix the code format before commit.
  • Document any change in the CHANGELOG.md.

[oscarotero]

Thanks!
Some of the comments in #680 can be applied here.

[into-the-v0id]

Note: CompressionStream cannot be used for this plugin since it only implements deflate based compression algorithms - so it does not support brotli.

[into-the-v0id]

PR updated to use a processor instead of a event.

[oscarotero]

thank you!