[MAINTENANCE] Use `set` instead of `create` in DatasourceStore

[anthonyburdi]

Changes proposed in this pull request:

• Refactor to use set instead of create in DatasourceStore
• Refactor test_datasource_crud.py to use parametric tests for each data context type
• Partial refactor of private datasource creation methods to not require a name in addition to the name being in the DatasourceConfig
• Note: schema roundtrip to deal with id vs id_ is being handled in a separate PR
• Note: This is a partial implementation of code from https://github.com/great-expectations/great_expectations/pull/5664

Definition of Done

Please delete options that are not relevant.

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

Thank you for submitting!

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[anthonyburdi]

Was incorporated in https://github.com/great-expectations/great_expectations/pull/5941, https://github.com/great-expectations/great_expectations/pull/5901, https://github.com/great-expectations/great_expectations/pull/5813 and others in Aug 2022