feat: Compact whitespace in db.query.text by default

[chmodas]

Both QueryTextMode::Full (default) and QueryTextMode::Obfuscated now collapse inter-token whitespace runs to a single space and trim leading/trailing whitespace before emitting db.query.text. Whitespace inside string literals, quoted identifiers, dollar-quoted bodies, and comments is preserved verbatim. Multi-line SQL written for source-level readability now renders as a single readable line in OTel exports without padding the captured value with embedded \n and indentation runs. QueryTextMode::Off is unchanged.

The new compact_whitespace pass runs at the executor dispatch site as compact_whitespace(sql) for Full and compact_whitespace(obfuscate(sql)) for Obfuscated, keeping value redaction and whitespace cosmetics decoupled.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.96%. Comparing base (00f43f2) to head (f8fc91f).
⚠️ Report is 1 commits behind head on trunk.
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Additional details and impacted files

@@           Coverage Diff            @@
##            trunk      #34    +/-   ##
========================================
  Coverage   99.95%   99.96%            
========================================
  Files          12       13     +1     
  Lines        2182     2552   +370     
========================================
+ Hits         2181     2551   +370     
  Misses          1        1            

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