grpc sleep endpoint for infra testing

[chris-gorham]

Description

grpc sleep for infra timeout testing.

Test plan

How did you test the new or updated feature?

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] gRPC:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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