guardrails: enable cross-region inference

[lucafolloni]

Describe the feature

Guardrails construct is missing a flag to enable cross-region inference and standard tier (thus defaulting to classic).

Use Case

Standard tier on the guardrails allows for better detection and offers increased consistency when determining if the guardrails should be triggered

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

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