feat: migrate from autorest/adal to azidentity

[aramase]

Signed-off-by: Anish Ramasekar anish.ramasekar@gmail.com

Reason for Change:

• Migrate from autorest/adal to azidentity
• Migrate from github.com/Azure/azure-sdk-for-go/services/keyvault to sdk/keyvault

Issue Fixed:

fixes #179
fixes #180

Notes for Reviewers:

[aramase]

@bingosummer It looks azidentity expects the authority host to be https. I had to comment this out because it failed the unit test

=== RUN   TestNewKeyVaultClient/no_error_with_proxy_mode
    /go/src/github.com/Azure/kubernetes-kms/pkg/plugin/keyvault_test.go:135: newKeyVaultClient() failed with error: failed to get key vault token, error: cannot use an authority host without https

I assume it'll fail when proxy is used but let's test this. The test image is aramase/keyvault:azkeys.00.

[bingosummer]

I didn't hit the error cannot use an authority host without https, but I hit the following error.

I0109 08:06:14.823988       1 server.go:77] encrypt request started
E0109 08:06:15.063933       1 server.go:80] "failed to encrypt" err="failed to encrypt, error: challenge resource \"https://vault.azure.net\" doesn't match the requested domain. Set DisableChallengeResourceVerification to true in your client options to disable. See https://aka.ms/azsdk/blog/vault-uri for more information"
E0109 08:06:15.064069       1 grpc.go:45] "GRPC request error" err="failed to encrypt, error: challenge resource \"https://vault.azure.net\" doesn't match the requested domain. Set DisableChallengeResourceVerification to true in your client options to disable. See https://aka.ms/azsdk/blog/vault-uri for more information"

Will test again later about the error cannot use an authority host without https.

[bingosummer]

When I use SP instead of managed identity, I hit an error:

E0109 11:06:13.954338       1 grpc.go:45] "GRPC request error" err=<
	failed to encrypt, error: ClientSecretCredential authentication failed
	POST https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/oauth2/v2.0/token
	--------------------------------------------------------------------------------
	RESPONSE 400 Bad Request
	--------------------------------------------------------------------------------
	{
	  "error": "invalid_scope",
	  "error_description": "AADSTS70011: The provided request must include a 'scope' input parameter. The provided value for the input parameter 'scope' is not valid. The scope https://vault.azure.net openid offline_access profile is not valid.\r\nTrace ID: 75447226-d7f4-45c3-a56c-b844c719ea04\r\nCorrelation ID: 44d79503-6a49-49fc-9efb-ab6bc481c0e9\r\nTimestamp: 2023-01-09 11:06:13Z",
	  "error_codes": [
	    70011
	  ],
	  "timestamp": "2023-01-09 11:06:13Z",
	  "trace_id": "75447226-d7f4-45c3-a56c-b844c719ea04",
	  "correlation_id": "44d79503-6a49-49fc-9efb-ab6bc481c0e9"
	}
	--------------------------------------------------------------------------------
	To troubleshoot, visit https://aka.ms/azsdk/go/identity/troubleshoot#client-secret
 >