fix(rome_lsp): fix the parsing of the Workspace root URI on Windows

[leops]

Summary

Fixes #3182

In the Language Server Protocol, the path to the workspace root is sent from the editor to the language server as a URI. In order to load the configuration file from the disk we need to parse this URI as a filesystem path, previously this was done by extracting the path segment of the URI which works on Unix systems (the URI file:///home/user/workspace becomes the path /home/user/workspace) but is not sufficient on Windows where the drive ID needs to be decoded: the URI file:///c%3A/users/user/workspace should be parsed as c:/users/user/workspace but was previously interpreted as /c%3A/users/user/workspace

Test Plan

Unfortunately this relies on OS-specific code (the implementation of the Uri::to_file_path differs depending on the target platform) so it's hard to test automatically as we do not run tests on Windows. Instead I just built and run the language server locally and verified it could parse the workspace path and load the configuration file correctly on Windows

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