auto-instrumentation registration

[brettmc]

• porting Nevay's PoC registering auto-instrumentation packages via SPI with file-based config.
• extend to support auto-loading:
  • use the not-yet-released v0.3 of file-based configuration (which combines SDK and instrumentation config)
  • The existence of the OTEL_EXPERIMENTAL_CONFIG_FILE defines where the SDK config file resides (relative to CWD), and also acts as a trigger to autoload via SPI rather than our current env-based version
  • move single-use code (create hook manager + config parsing + actual registration) into classes
  • support general instrumentation config (which is described in the file-based config spec)
  • support map-based array-like config (which is used by instrumentation configuration)

todo:

• [x] SDK autoloader should use noop hook manager if opentelemetry extension not available

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 52.78810% with 127 lines in your changes missing coverage. Please review.

Project coverage is 74.20%. Comparing base (17ad56a) to head (933dce7).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1304      +/-   ##
============================================
- Coverage     74.61%   74.20%   -0.41%     
- Complexity     2504     2562      +58     
============================================
  Files           355      372      +17     
  Lines          7180     7386     +206     
============================================
+ Hits           5357     5481     +124     
- Misses         1823     1905      +82     

Flag	Coverage Δ
8.1	73.88% <52.78%> (-0.43%)	:arrow_down:
8.2	74.13% <52.78%> (-0.38%)	:arrow_down:
8.3	74.11% <52.78%> (-0.42%)	:arrow_down:
8.4	74.05% <52.78%> (-0.45%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/API/Globals.php	100.00% <100.00%> (+5.88%)	:arrow_up:
...tion/AutoInstrumentation/ConfigurationRegistry.php	100.00% <100.00%> (ø)
...PI/Instrumentation/AutoInstrumentation/Context.php	100.00% <100.00%> (ø)
...nstrumentation/AutoInstrumentation/HookManager.php	100.00% <100.00%> (ø)
src/API/Logs/LateBindingLogger.php	100.00% <100.00%> (ø)
src/API/Logs/LateBindingLoggerProvider.php	100.00% <100.00%> (ø)
src/API/Metrics/LateBindingMeterProvider.php	100.00% <100.00%> (ø)
src/API/Trace/LateBindingTracer.php	100.00% <100.00%> (ø)
src/API/Trace/LateBindingTracerProvider.php	100.00% <100.00%> (ø)
.../Config/SDK/Configuration/ConfigurationFactory.php	100.00% <100.00%> (+25.49%)	:arrow_up:
... and 13 more

... and 9 files with indirect coverage changes

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[brettmc]

@open-telemetry/php-approvers @Nevay I think I'm happy with this and it's ready for review!

NB that we should not merge until a new version of opentelemetry-config is tagged, which should be v0.3