Improve filtering options for Clippy's lint list

[xFrednet]

Clippy's lint list currently allows filtering by lint and group. It would be helpful to add more filters for the applicability and version values which are available. The filter design that is currently used is not set in stone, feel free to experiment a bit and make some design suggestions.

The HTML document of the page can be found under util/gh-pages/index.html. cargo dev serve can be used to test the changes locally. The current lint data representation can be found in the gh-pages branch here

Main tracking issue #7172

[flip1995]

Possible improvements for the current filters:

• Group filter:
  • Make drop-down menu
  • Add options to select all / none
• Lint levels:
  • Possibly the same as for groups?
• Search
  • Fuzzy search (for lint names)

Possible new filters:

• Version
  • greater
  • equal
  • less
• Applicability
  • Filter by applicability group
  • Same interface as the one suggested for groups and levels

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Example for drop down menu, screenshot taken from https://toggle.com:

[xFrednet]

A search only in lint name function would also be nice. (The current string search matches with the lint name and description)

[repi]

Would be great to be able to esp. filter on the version the lint was introduced, use that quite frequently to test lints in newer Rust versions.

[Serial-ATA]

I'll give the version filter a shot