Optionally use binstall to speed up CI

[FlareFlo]

Do the checklist before filing an issue:

• Is this related to the actions-rs Actions?
  If you think it's a problem related to Github Actions in general, use GitHub Community forum instead: https://github.community
• You've read the Contributing section about feature requests: https://github.com/actions-rs/.github/blob/master/CONTRIBUTING.md#feature-requests
• Is this something you can debug and fix? Send a pull request! Bug fixes and documentation fixes are welcome.

Motivation

From-source builds in CI with grcov take time and resources, so utilizing binstall would mean milliseconds instead of minutes for installation.
This requires binstall to be present on the action runner, which can be solved with its action.

Workflow example

- uses: codecov/codecov-action@v3
  with:
    binstall: true # default = false