Add auto-instrumentation for PHP output buffering control functions

[HeenaBansal20]

This PR adds auto instrumentation for pHP output buffering control functions

ob_start()
ob_flush()
ob_clean()
flush()

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.90%. Comparing base (21c82d2) to head (d3523db).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Instrumentation/IO/src/IOInstrumentation.php	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #437      +/-   ##
============================================
- Coverage     83.12%   81.90%   -1.22%     
- Complexity     1396     1988     +592     
============================================
  Files            97      137      +40     
  Lines          5599     8096    +2497     
============================================
+ Hits           4654     6631    +1977     
- Misses          945     1465     +520     

Flag	Coverage Δ
Aws	93.41% <ø> (+0.82%)	⬆️
Context/Swoole	0.00% <ø> (ø)
Exporter/Instana	49.42% <ø> (ø)
Instrumentation/AwsSdk	81.13% <ø> (ø)
Instrumentation/CakePHP	20.40% <ø> (ø)
Instrumentation/CodeIgniter	73.98% <ø> (ø)
Instrumentation/Curl	87.66% <ø> (ø)
Instrumentation/Doctrine	92.92% <ø> (ø)
Instrumentation/ExtAmqp	88.48% <ø> (ø)
Instrumentation/ExtRdKafka	86.11% <ø> (ø)
Instrumentation/Guzzle	75.58% <ø> (ø)
Instrumentation/HttpAsyncClient	78.04% <ø> (ø)
Instrumentation/IO	0.00% <0.00%> (-70.69%)	⬇️
Instrumentation/Laravel	70.97% <ø> (?)
Instrumentation/MySqli	95.81% <ø> (ø)
Instrumentation/OpenAIPHP	87.21% <ø> (ø)
Instrumentation/PDO	94.21% <ø> (ø)
Instrumentation/PostgreSql	93.54% <ø> (ø)
Instrumentation/Psr14	76.47% <ø> (ø)
Instrumentation/Psr15	89.15% <ø> (ø)
Instrumentation/Psr16	97.50% <ø> (ø)
Instrumentation/Psr18	77.46% <ø> (ø)
Instrumentation/Psr3	67.01% <ø> (ø)
Instrumentation/Psr6	97.61% <ø> (ø)
Instrumentation/ReactPHP	99.45% <ø> (ø)
Instrumentation/Session	94.52% <ø> (?)
Instrumentation/Slim	86.11% <ø> (ø)
Instrumentation/Symfony	84.88% <ø> (ø)
Instrumentation/Yii	77.86% <ø> (ø)
Logs/Monolog	100.00% <ø> (ø)
Propagation/CloudTrace	89.77% <ø> (ø)
Propagation/Instana	98.11% <ø> (ø)
Propagation/ServerTiming	100.00% <ø> (ø)
Propagation/TraceResponse	100.00% <ø> (ø)
ResourceDetectors/Azure	91.66% <ø> (ø)
ResourceDetectors/Container	93.02% <ø> (ø)
ResourceDetectors/DigitalOcean	100.00% <ø> (ø)
Sampler/RuleBased	33.51% <ø> (ø)
Sampler/Xray	78.23% <ø> (?)
Shims/OpenTracing	92.45% <ø> (ø)
Utils/Test	87.53% <ø> (?)

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Files with missing lines	Coverage Δ
src/Instrumentation/IO/src/IOInstrumentation.php	0.00% <0.00%> (-70.69%)	⬇️

... and 39 files with indirect coverage changes

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[HeenaBansal20]

@brettmc , Thanks for approving the PR. I have question..
Should I remove curl_exec and curl_init from IO package ? since they are already covered in seperate auto-curl package and these functions doesn't belong to IO category ?

[brettmc]

Should I remove curl_exec and curl_init from IO package

Yes, I agree with you. Can you submit it as a separate PR?

[HeenaBansal20]

Should I remove curl_exec and curl_init from IO package

Yes, I agree with you. Can you submit it as a separate PR?

Sure I'll take it in a separate PR.
Thanks