Add option to disable debug scopes

[Nevay]

Allows disabling debug scopes via OTEL_PHP_DEBUG_SCOPES_DISABLED; resolves #1140 (comment).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a196c13) 84.08% compared to head (1f5aecc) 84.09%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1205   +/-   ##
=========================================
  Coverage     84.08%   84.09%           
- Complexity     2237     2239    +2     
=========================================
  Files           285      285           
  Lines          6359     6362    +3     
=========================================
+ Hits           5347     5350    +3     
  Misses         1012     1012           

Flag	Coverage Δ
7.4	82.76% <100.00%> (+<0.01%)	⬆️
8.0	84.02% <100.00%> (+<0.01%)	⬆️
8.1	84.15% <100.00%> (+<0.01%)	⬆️
8.2	84.15% <100.00%> (+<0.01%)	⬆️
8.3	84.15% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
src/Context/Context.php	82.22% <100.00%> (+1.26%)	⬆️

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