* test: Add E2E test for using pluggable state storage with the `providers` command
Note: I've excluded the `terraform providers locks` and `terraform providers mirror` commands as they don't interact with backends.
* test: Add integration test for using pluggable state storage with the `providers` command
* refactor: Change ioutil.ReadDir to os.ReadDir
* test: Add integration test for using pluggable state storage with the `providers schema` command
* feat: Allow state store schema's to be included when schemas are marshalled into JSON output
* test: Assert that state stores are present in provider schemas returned from `providers schema`.
* test: Update existing tests to accommodate state stores being in provider schema output
* test: Update E2E test for `providers` commands to be better scoped to testing use of a state store to access and use state when generating output.
This complements TestProvidersSchema that tests that state stores in a provider are reflected in the JSON representations of the schemas that the command returns.
* chore: Replace `io/ioutil` with `io` in `providers schema` tests
* Add method to allow accessing factories from locks that are in memory
* Create new getStateStoreProviderFactory method for accessing a factory from config
* Update getStateStoreProviderFactory to use in memory locks instead of reading them from the deps lock file. Update calling code to accommodate this.
* Add tests for getStateStoreProviderFactory, improve errors returned from method
* Update test following schema change in simple providers
* Move test case into e2etest package, so we protect against environments where building binaries isn't possible
* Fix issues with running test in e2etest package
* Update code comments
Co-authored-by: Radek Simko <radeksimko@users.noreply.github.com>
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Co-authored-by: Radek Simko <radeksimko@users.noreply.github.com>
