[Feature]: Add mods to cs2 server

### User story

As serveradmin i want be able to install basic mods for CS2 server

### Game

CS2

### Linux distro

Debian 12

### Command

command: mods-install

### Further information

There is currently no mod install available for cs2 servers.
it is however totally possible to install mods manually like metamod. BUT: installing metamod requires altering the gameinfo.gi wich on every update gets rewritten thus loosing the mod.

if installed metamod via lgsm i would expect it to take care about this gameinfo.gi file for example.

importand mods would be at least:
- metamod ( https://www.sourcemm.net/downloads.php/?branch=master )
- [CounterStrikeSharp](https://docs.cssharp.dev/index.html)

id be very willing to help out, but have no real experience with lgsm development so currently a little stuck ;)

Cheers and thanks for reading