Chore: Updated README.md for database context propagation supported query functions

[jerrytfleung]

Updated README.md for MySqli, PDO & PostgreSql database instrumentation library to provide details of the context propagation supported query functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.52%. Comparing base (f042bae) to head (db39a93).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #450   +/-   ##
=========================================
  Coverage     82.52%   82.52%           
  Complexity     2414     2414           
=========================================
  Files           167      167           
  Lines          9711     9711           
=========================================
  Hits           8014     8014           
  Misses         1697     1697           

Flag	Coverage Δ
Aws	93.41% <ø> (ø)
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	78.99% <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% <ø> (ø)
Instrumentation/Laravel	71.66% <ø> (ø)
Instrumentation/MongoDB	74.28% <ø> (ø)
Instrumentation/MySqli	93.94% <ø> (ø)
Instrumentation/OpenAIPHP	87.21% <ø> (ø)
Instrumentation/PDO	86.24% <ø> (ø)
Instrumentation/PostgreSql	91.89% <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> (ø)
Instrumentation/Slim	84.28% <ø> (ø)
Instrumentation/Symfony	84.03% <ø> (ø)
Instrumentation/Yii	83.05% <ø> (ø)
Logs/Monolog	100.00% <ø> (ø)
Propagation/CloudTrace	89.77% <ø> (ø)
Propagation/Instana	98.11% <ø> (ø)
Propagation/ServerTiming	94.73% <ø> (ø)
Propagation/TraceResponse	94.73% <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> (ø)
Shims/OpenTracing	92.45% <ø> (ø)
SqlCommenter	95.65% <ø> (ø)
Symfony	87.81% <ø> (ø)
Utils/Test	87.53% <ø> (ø)

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