Rename relaying to relay

[zhiqwang]

• Rename yolort.relaying to yolort.relay
• Rename YOLOInference to YOLOTRTInference

[codecov]

Codecov Report

Merging #313 (cdcd496) into main (19dd69a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #313   +/-   ##
=======================================
  Coverage   94.94%   94.94%           
=======================================
  Files          10       10           
  Lines         732      732           
=======================================
  Hits          695      695           
  Misses         37       37           

Flag	Coverage Δ
unittests	94.94% <100.00%> (ø)

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Impacted Files	Coverage Δ
test/test_relay.py	100.00% <100.00%> (ø)

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