fix: hash usernames to avoid special character clashes

[RobertCraigie]

This PR ensures we hash usernames instead of naively including them in the file path which can lead to issues due to special characters.

I don't think there's any value in stripping special characters as this path is not intended to be user facing and it could lead to clashes even though that is incredibly unlikely.

If you're debugging an issue relating to this directory then you can turn on debug logs to see which directory we're using.

closes #146

[codecov]

Codecov Report

Base: 70.52% // Head: 71.62% // Increases project coverage by +1.09% 🎉

Coverage data is based on head (9cc4c17) compared to base (67b95d7).
Patch coverage: 82.60% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   70.52%   71.62%   +1.09%     
==========================================
  Files          14       15       +1     
  Lines         648      659      +11     
==========================================
+ Hits          457      472      +15     
+ Misses        191      187       -4     

Impacted Files	Coverage Δ
pyright/langserver.py	0.00% <0.00%> (ø)
pyright/_utils.py	71.42% <71.42%> (ø)
pyright/utils.py	81.39% <100.00%> (+2.67%)	⬆️
tests/test_langserver.py	100.00% <100.00%> (ø)
tests/test_main.py	100.00% <100.00%> (ø)

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