[New Resource] - azurerm_machine_learning_datastore

[xuzhang3]

Fixes: #14701

=== CONT  TestAccMachineLearningDataStore_dataLakeGen2WithSpn
=== CONT  TestAccMachineLearningDataStore_dataLakeGen2Basic
--- PASS: TestAccMachineLearningDataStore_dataLakeGen2Basic (636.77s)
--- PASS: TestAccMachineLearningDataStore_blobStorageAccountKey (638.04s)
--- PASS: TestAccMachineLearningDataStore_blobStorageSasToken (643.68s)
--- PASS: TestAccMachineLearningDataStore_dataLakeGen2WithSpn (643.91s)
--- PASS: TestAccMachineLearningDataStore_fileShareSas (651.29s)
--- PASS: TestAccMachineLearningDataStore_fileShareAccountKey (663.93s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/machinelearning       682.103s

[stephybun]

Thanks for this PR @xuzhang3, this will be a great addition to machine learning services! There are however a few larger changes that need to happen before we can consider introducing this resource.

1. Since this resource can support multiple types, we should actually split this out into a resource for each type - the user experience will be better and more consistent.
2. The resources need to be typed, since they will need to be typed in the future for resource generation from Pandora.

[stephybun]

We can reduce these two properties down to one workspace_id

[stephybun]

We shouldn't expose type, this resource should probably be split out into a separate resource for each type. In addition Data Lake Gen 1 is EOL, so perhaps we should only consider creating a resource for this if explicitly requested?

[xuzhang3]

@stephybun thanks for reviewing this PR, I will close this PR and submit another PR for different types of this resources

[github-actions]

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