feat: Add provisioned throughput support to aws_bedrockagent_agent_alias

[acwwat]

Description

This PR is to add the provisioned_throughput argument to the routing_configuration block of the aws_bedrockagent_agent_alias resource. Note that it is cost prohibitive to test this feature, so I've added a test case but set it to skip similar to how it's done for the aws_bedrock_provisioned_model_throughput tests.

Relations

Closes #37489

References

Referred to AgentAliasRoutingConfigurationListItem for specs and wordings.

Output from Acceptance Testing

$ make testacc TESTS=TestAccBedrockAgentAgentAlias_ PKG=bedrockagent
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.2 test ./internal/service/bedrockagent/... -v -count 1 -parallel 20 -run='TestAccBedrockAgentAgentAlias_'  -timeout 360m
=== RUN   TestAccBedrockAgentAgentAlias_basic
=== PAUSE TestAccBedrockAgentAgentAlias_basic
=== RUN   TestAccBedrockAgentAgentAlias_disappears
=== PAUSE TestAccBedrockAgentAgentAlias_disappears
=== RUN   TestAccBedrockAgentAgentAlias_update
=== PAUSE TestAccBedrockAgentAgentAlias_update
=== RUN   TestAccBedrockAgentAgentAlias_routingUpdate
=== PAUSE TestAccBedrockAgentAgentAlias_routingUpdate
=== RUN   TestAccBedrockAgentAgentAlias_tags
=== PAUSE TestAccBedrockAgentAgentAlias_tags
=== RUN   TestAccBedrockAgentAgentAlias_provisionedThroughput
    agent_alias_test.go:227: Bedrock Provisioned Model Throughput for Antropic Claude 2 has a minimum 1 month commitment and costs > $45K/month
--- SKIP: TestAccBedrockAgentAgentAlias_provisionedThroughput (0.00s)
=== CONT  TestAccBedrockAgentAgentAlias_basic
=== CONT  TestAccBedrockAgentAgentAlias_routingUpdate
=== CONT  TestAccBedrockAgentAgentAlias_update
=== CONT  TestAccBedrockAgentAgentAlias_disappears
=== CONT  TestAccBedrockAgentAgentAlias_tags
--- PASS: TestAccBedrockAgentAgentAlias_disappears (31.74s)
--- PASS: TestAccBedrockAgentAgentAlias_basic (39.55s)
--- PASS: TestAccBedrockAgentAgentAlias_update (44.49s)
--- PASS: TestAccBedrockAgentAgentAlias_routingUpdate (51.30s)
--- PASS: TestAccBedrockAgentAgentAlias_tags (54.32s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/bedrockagent       54.532s

[github-actions]

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