Add metric to track congested transactions

[halfprice]

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Release notes

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

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Name	Status	Preview	Comments	Updated (UTC)
sui-core	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 24, 2024 5:45pm

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multisig-toolkit	⬜️ Ignored (Inspect)	Visit Preview		Apr 24, 2024 5:45pm
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