Source Bigcommerce Dataset: Refactor to use the CDK

[htrueman]

What

Part of #7242 story
Closes #7332

Pre-merge Checklist

Expand the relevant checklist and delete the others.

New Connector

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• Code reviews completed
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  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions
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Airbyter

If this is a community PR, the Airbyte engineer reviewing this PR is responsible for the below items.

• Create a non-forked branch based on this PR and test the below items on it
• Build is successful
• Credentials added to Github CI. Instructions.
• /test connector=connectors/<name> command is passing.
• New Connector version released on Dockerhub by running the /publish command described here

Connector Generator

• Issue acceptance criteria met
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• Documentation which references the generator is updated as needed.

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[htrueman]

/test connector=connectors/source-bigcommerce

🕑 connectors/source-bigcommerce https://github.com/airbytehq/airbyte/actions/runs/1394878707
✅ connectors/source-bigcommerce https://github.com/airbytehq/airbyte/actions/runs/1394878707
Python tests coverage:

	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                                                 Stmts   Miss  Cover
	 ------------------------------------------------------------------------
	 source_acceptance_test/__init__.py                       2      0   100%
	 source_acceptance_test/base.py                          10      4    60%
	 source_acceptance_test/config.py                        74      8    89%
	 source_acceptance_test/conftest.py                     108    108     0%
	 source_acceptance_test/plugin.py                        47     47     0%
	 source_acceptance_test/tests/__init__.py                 4      0   100%
	 source_acceptance_test/tests/test_core.py              200     94    53%
	 source_acceptance_test/tests/test_full_refresh.py       18     11    39%
	 source_acceptance_test/tests/test_incremental.py        69     38    45%
	 source_acceptance_test/utils/__init__.py                 6      0   100%
	 source_acceptance_test/utils/asserts.py                 37      2    95%
	 source_acceptance_test/utils/common.py                  41     24    41%
	 source_acceptance_test/utils/compare.py                 47     20    57%
	 source_acceptance_test/utils/connector_runner.py        82     49    40%
	 source_acceptance_test/utils/json_schema_helper.py     115     14    88%
	 ------------------------------------------------------------------------
	 TOTAL                                                  860    419    51%
	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                             Stmts   Miss  Cover
	 ----------------------------------------------------
	 source_bigcommerce/__init__.py       2      2     0%
	 source_bigcommerce/source.py       138    138     0%
	 ----------------------------------------------------
	 TOTAL                              140    140     0%