feat: bedrock-oss-provisioned-throughput-polling

[lucasjia-aws]

Description

Add provisioned throughput polling for Bedrock OSS (non-Nova) model deployments.

Previously, BedrockModelBuilder.deploy() for OSS models would fire off a create_model_import_job call and return immediately, leaving the user to manually wait for the import to complete and then create provisioned throughput themselves. This PR makes the non-Nova path synchronous end-to-end, matching the behavior of the Nova deployment path.

Changes

Implementation (bedrock_model_builder.py):

• Non-Nova deploy() now waits for the import job to complete, then creates provisioned model throughput and waits for it to become InService before returning.
• New public method: create_provisioned_throughput() — creates provisioned throughput for an imported model and polls until ready.
• New private methods: _wait_for_import_job_complete(), _wait_for_provisioned_throughput_in_service().
• New deploy() parameters for non-Nova path: provisioned_model_name, model_units, commitment_duration, provisioned_model_tags.

Unit tests (test_bedrock_model_builder.py):

• Updated existing non-Nova deploy tests to reflect the new synchronous behavior.
• Added test classes: TestWaitForImportJobComplete, TestCreateProvisionedThroughput, TestWaitForProvisionedThroughputInService.

Integration test (test_bedrock_provisioned_throughput.py):

• New integ test file covering the full deploy flow and standalone create_provisioned_throughput() usage.

Testing

• Unit tests cover all new methods (happy path, polling, failure, timeout).
• Integration test validated locally against real Bedrock APIs — import job creation, polling to completion, and CreateProvisionedModelThroughput API call all succeeded (blocked only by account-level service quota, not code issues).