feat: AWS Bedrock guardrails, provisioned throughput & invocation logging SDK-compat

[NitinKumar004]

Extend the Bedrock SDK-compat handler (built in #160) with the remaining control-plane management surface.

Operations:

• Guardrails: CreateGuardrail, GetGuardrail, ListGuardrails, UpdateGuardrail, DeleteGuardrail
• Provisioned model throughput: CreateProvisionedModelThroughput, GetProvisionedModelThroughput, ListProvisionedModelThroughputs, DeleteProvisionedModelThroughput
• Model invocation logging: PutModelInvocationLoggingConfiguration, GetModelInvocationLoggingConfiguration, DeleteModelInvocationLoggingConfiguration