solr: add startup plist

Added a plist startup like was previously done in
[solr36](https://github.com/Homebrew/homebrew-versions/commit/4fa8b9b3c8f37667f1d993a53a6b9da383d87179)
at Homebrew/homebrew-versions#366.

Closes #32069.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>