add support for iam resources for google_compute_image

[megan07]

Fixes hashicorp/terraform-provider-google#4782

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

`google_compute_image_iam_binding`

`google_compute_image_iam_member`

`google_compute_image_iam_policy`

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 559 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 5 files changed, 930 insertions(+), 2 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=140973"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataSourceComputeInstanceSerialPort_basic|TestAccDataSourceComputeInstance_basic|TestAccComputeImageIamBindingGenerated|TestAccComputeImageIamMemberGenerated|TestAccComputeImageIamPolicyGenerated|TestAccComputeImageIamBindingGenerated_withCondition|TestAccComputeImageIamMemberGenerated_withCondition|TestAccComputeImageIamPolicyGenerated_withCondition|TestAccActiveDirectoryDomain_activeDirectoryDomainBasicExample|TestAccActiveDirectoryDomainTrust_activeDirectoryDomainTrustBasicExample|TestAccAppEngineStandardAppVersion_update|TestAccComposerEnvironment_basic|TestAccComposerEnvironment_private|TestAccComposerEnvironment_update|TestAccComposerEnvironment_privateWithWebServerControl|TestAccComposerEnvironment_withUpdateOnCreate|TestAccComposerEnvironment_withSoftwareConfig|TestAccComputeAttachedDisk_count|TestAccComposerEnvironment_withNodeConfig|TestAccComputeBackendService_withMaxRatePerEndpoint|TestAccComputeBackendService_withMaxConnectionsPerEndpoint|TestAccComputeHealthCheck_healthCheckGrpcExample|TestAccComputeHealthCheck_healthCheckGrpcFullExample|TestAccComputeInstanceFromTemplate_basic|TestAccComputeRegionDisk_deleteDetach|TestAccComputeRegionHealthCheck_regionHealthCheckGrpcExample|TestAccComputeRegionHealthCheck_regionHealthCheckGrpcFullExample|TestAccRegionInstanceGroupManager_basic|TestAccComputeVpnGateway_targetVpnGatewayBasicExample|TestAccComputeVpnTunnel_vpnTunnelBasicExample|TestAccComputeVpnTunnel_vpnTunnelBetaExample|TestAccComputeVpnTunnel_router|TestAccComputeVpnTunnel_defaultTrafficSelectors|TestAccContainerCluster_withNodePoolNodeConfig|TestAccContainerCluster_nodeAutoprovisioning|TestAccContainerNodePool_withKubeletConfig|TestAccContainerNodePool_withInvalidKubeletCpuManagerPolicy|TestAccContainerNodePool_withLinuxNodeConfig|TestAccContainerNodePool_withWorkloadIdentityConfig|TestAccMemcacheInstance_update|TestAccMemcacheInstance_memcacheInstanceBasicExample|TestAccNetworkManagementConnectivityTest_networkManagementConnectivityTestInstancesExample|TestAccNetworkManagementConnectivityTest_networkManagementConnectivityTestAddressesExample|TestAccNetworkManagementConnectivityTest_update You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=140977"

[slevenick]

Looks good to me!