Quick update pass

[Blacksmoke16]

Does a quick pass to update some things related to changes made in the main lib. This repo could use some more work, but this should at least make CI happy. I don't really have a way verify these changes, other than the unit tests.

• Fix tests
• Use Docker image
• Require min of PHP 7.3
• Exclude examples from static analysis for now

Resolves #19

[codecov]

Codecov Report

Merging #20 (cbf0aef) into main (29fb65f) will increase coverage by 0.55%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main      #20      +/-   ##
============================================
+ Coverage     88.73%   89.28%   +0.55%     
+ Complexity       88       86       -2     
============================================
  Files             6        6              
  Lines           213      224      +11     
============================================
+ Hits            189      200      +11     
  Misses           24       24              

Impacted Files	Coverage Δ
detectors/aws/Ec2Detector.php	97.01% <ø> (ø)
detectors/aws/EcsDetector.php	80.00% <ø> (ø)
detectors/aws/EksDetector.php	70.68% <ø> (ø)
detectors/aws/LambdaDetector.php	100.00% <ø> (ø)
instrumentation/aws/xray/AwsXrayIdGenerator.php	100.00% <ø> (ø)
propagators/aws/xray/AwsXrayPropagator.php	100.00% <100.00%> (ø)

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[bobstrecansky]

That Pslam error is sort of strange to me. Wondering if we should try and fix it or move through.