feat: add EKS Pod Identity credential provider #440

Job	Run time
unit_test	1m 7s
check_secrets	3s
test_authorized_user_provider	0s
signing_test	0s
test_vm_metadata_provider	0s
test_external_account_provider	0s
test_default_provider	0s
test_impersonated_service_account_provider	0s
test_static_provider	0s
test_summary	3s
	1m 13s

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