implement rule-based sampler

[brettmc]

Ported rule-based sampler from https://github.com/Nevay/otel-sdk-contrib-sampler

Co-authored-by: Tobias Bachert [email protected]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 32.14286% with 114 lines in your changes missing coverage. Please review.

Project coverage is 82.68%. Comparing base (727236e) to head (75c26b6). Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...leBased/src/ComponentProvider/SamplerRuleBased.php	0.00%	28 Missing :warning:
...sed/src/ComponentProvider/SamplingRuleSpanKind.php	0.00%	26 Missing :warning:
...ed/src/ComponentProvider/SamplingRuleAttribute.php	0.00%	20 Missing :warning:
...sed/src/ComponentProvider/SamplingRuleSpanName.php	0.00%	14 Missing :warning:
...leBased/src/ComponentProvider/SamplingRuleLink.php	0.00%	13 Missing :warning:
...Based/src/ComponentProvider/SamplingRuleParent.php	0.00%	13 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #279      +/-   ##
============================================
+ Coverage     82.45%   82.68%   +0.23%     
+ Complexity     1073      948     -125     
============================================
  Files           104       89      -15     
  Lines          4480     3807     -673     
============================================
- Hits           3694     3148     -546     
+ Misses          786      659     -127     

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Files with missing lines	Coverage Δ
src/Sampler/RuleBased/src/RuleBasedSampler.php	100.00% <100.00%> (ø)
src/Sampler/RuleBased/src/RuleSet.php	100.00% <100.00%> (ø)
...mpler/RuleBased/src/SamplingRule/AttributeRule.php	100.00% <100.00%> (ø)
...rc/Sampler/RuleBased/src/SamplingRule/LinkRule.php	100.00% <100.00%> (ø)
.../Sampler/RuleBased/src/SamplingRule/ParentRule.php	100.00% <100.00%> (ø)
...ampler/RuleBased/src/SamplingRule/SpanKindRule.php	100.00% <100.00%> (ø)
...ampler/RuleBased/src/SamplingRule/SpanNameRule.php	100.00% <100.00%> (ø)
...leBased/src/ComponentProvider/SamplingRuleLink.php	0.00% <0.00%> (ø)
...Based/src/ComponentProvider/SamplingRuleParent.php	0.00% <0.00%> (ø)
...sed/src/ComponentProvider/SamplingRuleSpanName.php	0.00% <0.00%> (ø)
... and 3 more

... and 33 files with indirect coverage changes

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[brettmc]

I think this is ready for review now, @open-telemetry/php-approvers There's an OTEP which looks like it will eventually specify a rules-based sampler, so to avoid a future config collision I've changed the key for this one to contrib_rule_based (open to improved names, though!)