Merged in my work from https://github.com/great-expectations/great_ex…

[jdimatteo]

Merged in my work from #3135:

1. added documentation
2. using helper function _create_bigquery_engine with gcp project environment variable
3. added bigquery specific list in candidate_test_is_on_temporary_notimplemented_list_cfe
4. removed bigquery specific test files, so we can just use the already existing ones (along with bigquery specific notimplemented list per above number 3)

Example running:

(venv) jdimatteo@dimo:~/dev/great_expectations_fork_2$ time GE_TEST_BIGQUERY_PROJECT=jdimatteo-v pytest tests/test_definitions/test_expectations_cfe.py --bigquery --no-spark --no-postgresql -k bigquery
...
================================================================================= 173 passed, 266 skipped, 932 deselected, 159 warnings in 875.95s (0:14:35) =================================================================================

real	14m39.486s
user	0m30.010s
sys	0m3.358s

Definition of Done

Please delete options that are not relevant.

• My code follows the Great Expectations style guide
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added unit tests where applicable and made sure that new and existing tests are passing.
• I have run any local integration tests and made sure that nothing is broken.

Thank you for submitting!

[jdimatteo]

@Shinnnyshinshin I think it would be good to use the existing test definitions, e.g. tests/test_definitions/column_map_expectations/expect_column_values_to_be_unique.json. This PR changes it so these existing files are used instead.

[jdimatteo]

Including the cause with from is very helpful for debugging and it would be helpful if GE did that whenever catching and re-raising an exception!

[Shinnnyshinshin]

:) thank you very much. I'll start making some noise about this

[Shinnnyshinshin]

absolutely wonderful work. Very excited to see where this goes

[Shinnnyshinshin]

Seeing some linting errors, but I can take care of them on my end.