fix: unix domain socket path and examples

[jy4096]

udfunction test

udsink test

[codecov]

Codecov Report

Merging #6 (e5468dd) into main (043e109) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage   87.54%   87.54%           
=======================================
  Files           9        9           
  Lines         273      273           
  Branches       21       21           
=======================================
  Hits          239      239           
  Misses         32       32           
  Partials        2        2           

Impacted Files	Coverage Δ
pynumaflow/function/server.py	67.92% <100.00%> (ø)
pynumaflow/sink/server.py	61.36% <100.00%> (ø)

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