Add brotli compression for text-based inscriptions

[terror]

TODO:

• [x] Add more tests
• [ ] Have users configure compressor parameters?

[casey]

You can add a bool to Media::TABLE, true for text formats and false for non text formats, which determines what should be compressed. Only text should be compressed for now.

[Psifour]

Only text should be compressed for now.

I had tested the majority of our existing MIME types to verify which would benefit from brotli. The majority show gains with the 3d types being exceptionally well suited for compression.

[nammaki]

I hope this will be merged someday 🙏

[terror]

TODO (to get this shipped):

• [ ] Switch to dropbox rust brotli implementation (https://docs.rs/brotli/latest/brotli/)
• [ ] Handle these tests:
  • [ ] subcommand::server::tests::responses_are_brotlied
  • [ ] subcommand::server::tests::text_preview
  • [ ] subcommand::server::tests::text_preview_returns_error_when_content_is_not_utf8
  • [ ] subcommand::server::tests::text_preview_text_is_escaped