feat: language provider (windows only)

[jawee]

Provider for getting current OS language and keyboard language.

Only Windows support, developed the same thing for the c# version of glazewm.

Haven't been able to run it, pnpm dev fails with the error below. So it's untested.

 ERR_PNPM_RECURSIVE_RUN_FIRST_FAIL  @zebar/[email protected] dev: `npm run -s monitors -- --print0 | xargs -0 -P 99 
-I % sh -c 'npm run tauri dev -- -- -- open bar --args %'`
Exit status 255
 ELIFECYCLE  Command failed with exit code 255.