feat: add EKS Pod Identity credential provider #444

Job	Run time
check_secrets	3s
unit_test	2m 22s
test_imds_provider	1m 17s
test_client_secret_provider	0s
test_static_provider	0s
signing_test	0s
test_env_provider	0s
test_azure_cli_provider	0s
test_client_certificate_provider	0s
Test Summary	4s
	3m 46s

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