feat: add systemd-language-server

[cwrau]

Describe your changes

This adds the systemd-language-server package.

I didn't know how to test this, I just copied and adjusted from another pypi package 😅

Tested and works 👍

Issue ticket number and link

Checklist before requesting a review

• I have successfully tested installation of the package.
• I have successfully tested the package after installation.
  

Screenshots

[Conarius]

Testing is written in CONTRIBUTING.md
Or in short:
Configure your nvim config for mason that you use the local repo on your machine and then :MasonInstall with the new package.
It should then, when everything is done correctly, download and install the package.
For testing the function of the package you need to attach the LSP to the buffer of the file either via autocommand or manually.

[cwrau]

Testing is written in CONTRIBUTING.md Or in short: Configure your nvim config for mason that you use the local repo on your machine and then :MasonInstall with the new package. It should then, when everything is done correctly, download and install the package. For testing the function of the package you need to attach the LSP to the buffer of the file either via autocommand or manually.

Yeah, that works! Thanks!

Tho it should be mentioned which yq is needed, on arch (and in my personal preference) https://github.com/kislyuk/yq is the normal one, whereas on deb systems it's https://github.com/kislyuk/yq