Allow specifying path for lines of code (tokei) badge

[make-github-pseudonymous-again]

📋 Add functionality similar to the custom path version of GitHub repo file count to the Lines of code (via tokei) badge (See the size category). The line count should be the one output by tokei :path.

I am simply reiterating desire expressed by @feluelle and @jnm2 in #2731.

Currently the only way to achieve a similar result is to add a .tokeignore file which may be annoying for various reasons.

[chris48s]

Our badges are based on scraping the ones from by tokei.rs (we don't run tokei as a library in our own codebase)
https://github.com/XAMPPRocky/tokei#badges
I don't think their service has that feature, so I think this is a feature request for the upstream.

[make-github-pseudonymous-again]

Here is a link to the relevant upstream issue: XAMPPRocky/tokei_rs#2.

[paulmelnikow]

Since this is out of Shields' hands I'm going to close this, though feel free to reply here if there is any new information, and if it becomes actionable by shields we can reopen it.