Support custom metrics and trace labels provided from the context

[nhatthm]

Description

Support custom metrics and trace labels provided from the context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b373779) to head (32ef0f0).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #291   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        23    +1     
  Lines         1038      1075   +37     
=========================================
+ Hits          1038      1075   +37     

Flag	Coverage Δ
unittests-Linux-X64	100.00% <100.00%> (ø)
unittests-Windows-X64	100.00% <100.00%> (ø)
unittests-macOS-X64	100.00% <100.00%> (ø)

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[nhatthm]

@manishdangi98 could you please confirm if this matches your expectations?

[rajyan]

I think we can already add custom labels from context to "trace" by using "TraceQuery" option.
https://github.com/nhatthm/otelsql?tab=readme-ov-file#trace-query

My idea was to add an option similar for "metrics" too, and I'm currently using this patch to solve my problem.
master...rajyan:otelsql:master

I think this PR doesn't solve this issue described in #222 , because we cannot set labels from the "query".