[YAML] Basic integration testing framework.

[robertwb]

The tests themselves are defined in yaml as a series of pipelines, possibly with some setup code.

One of the key features of this framework is that if muliple providers vend the same transform each will be tested to ensure they have consistent behavior.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 111 lines in your changes are missing coverage. Please review.

Project coverage is 38.32%. Comparing base (65c3e8e) to head (772fba2).
Report is 25 commits behind head on master.

❗ Current head 772fba2 differs from pull request most recent head 10e0535. Consider uploading reports for the commit 10e0535 to get more accurate results

Files	Patch %	Lines
sdks/python/apache_beam/yaml/integration_tests.py	0.00%	102 Missing ⚠️
sdks/python/apache_beam/yaml/yaml_provider.py	0.00%	7 Missing ⚠️
sdks/python/apache_beam/testing/util.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29113       +/-   ##
===========================================
- Coverage   71.46%   38.32%   -33.14%     
===========================================
  Files         710      687       -23     
  Lines      104795   101794     -3001     
===========================================
- Hits        74887    39017    -35870     
- Misses      28277    61197    +32920     
+ Partials     1631     1580       -51     

Flag	Coverage Δ
python	29.93% <0.00%> (-51.34%)	⬇️

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