Support filtering what tools are updated

[ericcornelissen]

Summary

Add new options that allows users to list the tools that can be updated. This could be used to update a specific tool, use a matrix of tools to update, create update groups (e.g. update tooling related to X), or exclude certain tools that shouldn't be updated for whatever reason.

Suggestion

Add two new options:

1. only which lists tools that can be considered for updates - all other tools won't be updated
2. not which lists tools that cannot be considered for updates - all other tools may be updated

Interaction with other options

• max: can be combined with both only and not just fine, even if some combinations of values don't make sense (e.g. only: actionlint with max: 2).
• only and not should be mutually exclusive.

Examples

Only update one tool:

- uses: ericcornelissen/tool-versions-update-action@v0.1.0
  with:
    only: actionlint

Only update tooling related to shell scripts:

- uses: ericcornelissen/tool-versions-update-action@v0.1.0
  with:
    only: shellcheck, shfmt

Don't update a particular tool:

- uses: ericcornelissen/tool-versions-update-action@v0.1.0
  with:
    not: yamllint