Windows LSP process_spawn and console creation

[dgriffie79]

When using the LSP in Windows, the process spawned to run 'onyx check' creates a console which pops up while the process is running. This is a bit annoying when using vscode with lsp and I imagine other editors in windows.

I have found this can be disabled by passing CREATE_NO_WINDOW in to CreateProcessA, as seen here https://github.com/dgriffie79/onyx/commit/f80e8cefa0f2fec306ee24101157d137b56e9f53

Can this be exposed as an option in process_spawn?