Clean up Clang compiler warnings

[mjcarroll]

Cleans up three sets of warnings:

• There were a few unnecessary std::move calls
• Adds a copy assignment operator to CSVIterator to fulfill rule-of-three
• Suppress some warnings in the vendored remotery code via CMake.

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 80.54%. Comparing base (038e2f7) to head (a57ce65).

Files	Patch %	Lines
io/src/CSVStreams.cc	14.28%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #589   +/-   ##
=======================================
  Coverage   80.54%   80.54%           
=======================================
  Files          80       80           
  Lines       13573    13579    +6     
=======================================
+ Hits        10932    10937    +5     
- Misses       2641     2642    +1     

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