utils/git: Add linkify script.

This script linkifies (i.e. makes clickable in the terminal) text that appears
to be a pull request or issue reference (e.g. #12345 or PR12345) or a
40-character commit hash (e.g. abc123). You can configure git to automatically
send the output of commands that pipe their output through a pager, such as
`git log` and `git show`, through this script by running this command from
within your LLVM checkout:

git config core.pager 'llvm/utils/git/linkify | pager'

The pager command is run from the root of the repository even if the git
command is run from a subdirectory, so the relative path should always work.

It requires OSC 8 support in the terminal. For a list of compatible terminals,
see https://github.com/Alhadis/OSC8-Adoption

Reviewers: MaskRay

Reviewed By: MaskRay

Pull Request: https://github.com/llvm/llvm-project/pull/103496

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