feat(bedrock): add default prompt router

[aws-rafams]

Fixes #841

Default Prompt Routers are now supported in Prompt Management

CDK usage:

model: PromptRouter.fromDefaultId(DefaultPromptRouterIdentifier.ANTHROPIC_CLAUDE_V1, region)

Invoke succeeds:

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[krokoko]

Thanks @aws-rafams ! Waiting for the build to finish but looks good to me ! 2 things we can add here:

• CDK released the v2.174.1 which should fix the go packaging issue, we can upgrade it here <- done
• Add a code snippet to the Bedrock README to provide more info on this feature <- done

[MichaelWalker-git]

LGTM

[mergify]

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