Optionally allow commands to be set on a directory level

[DaniloDjokic]

Allow users to optionally set commands on a directory/project level.

This will allow the program to work as expected when the buffer with the proper extension is not currently open as well as allow users to setup specific commands for heterogeneous projects (Hugo for example).

Expose a new project_override_config field inside the config with Lua tables for each individual directory.

The code will check if the current buffer matches any of the specified directory roots and if so it will execute the provided command with the current mechanism.
If a directory root is set but a command is not, it will print the proper error message.

If a directory root is not found for the current buffer it will fallback to the extensions configuration.

Note. I've also updated stylua.toml according to the readme from the official repo as none-ls was not working with the provided one.

[karshPrime]

Oh a real useful enhancement, cheers for the update! I tried it locally, and it works as intended.

Merging it.