Bigquery fixes

[claudevdm]

Fix the following BigQuery enrichment transform issues

1. Conditions on more than one field returns duplicate rows
2. Batching returns incorrect results (checks equality of restriction field on all columns of the returned data)
3. Batched_condition_template does not wrap conditions in parenthesis

Issues 1 and 2 are fixed by keying batched requests by a tuple of values.
Issue 3 is fixed by wrapping conditions in parenthesis.

Also modify integration tests to

1. Set up and tear down a new table on each test
2. Add test cases for above mentioned issues
3. Verify actual enriched pcollection output

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[claudevdm]

R: @damccorm

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[damccorm]

Thanks! Just had one comment, otherwise this LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 58.90%. Comparing base (301286f) to head (b17abe9).
Report is 130 commits behind head on master.

Files with missing lines	Patch %	Lines
...he_beam/transforms/enrichment_handlers/bigquery.py	33.33%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #32780      +/-   ##
============================================
+ Coverage     58.84%   58.90%   +0.05%     
  Complexity     3091     3091              
============================================
  Files          1130     1131       +1     
  Lines        174044   174444     +400     
  Branches       3320     3312       -8     
============================================
+ Hits         102414   102753     +339     
- Misses        68293    68360      +67     
+ Partials       3337     3331       -6     

Flag	Coverage Δ
python	81.42% <33.33%> (+0.01%)	⬆️

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[damccorm]

LGTM, thanks! Yaml test failures are unrelated and failing at head, so merging