Added \Attribute::TARGET_PARAMETER to \OpenTelemetry\API\Instrumentation\SpanAttribute

[ChrisLightfootWild]

Fixes #1429

Although the added "test" might not be appropriate. Is there a better way to test this?

It just proves that phpstan is happy rather than asserting anything more concrete.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.64%. Comparing base (7b5cbb5) to head (5efb812).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1433      +/-   ##
============================================
- Coverage     73.66%   73.64%   -0.02%     
  Complexity     2685     2685              
============================================
  Files           387      387              
  Lines          7977     7977              
============================================
- Hits           5876     5875       -1     
- Misses         2101     2102       +1     

Flag	Coverage Δ
8.1	73.33% <ø> (+0.10%)	⬆️
8.2	73.50% <ø> (+0.03%)	⬆️
8.3	73.49% <ø> (+0.03%)	⬆️
8.4	73.51% <ø> (-0.09%)	⬇️

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Files with missing lines	Coverage Δ
src/API/Instrumentation/SpanAttribute.php	100.00% <ø> (ø)

... and 7 files with indirect coverage changes

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