Shared object congestion control stress test

[halfprice]

Description

This PR adds a stress test in simtest to test shared object congestion control. The test is a good catch for liveness issue related to shared object congestion control.

After creating the test, I manually added some liveness bugs in the code (e.g. do not remove deferred txn from root, which can cause checkpoint stall), and the test was able to catch such bugs.

It also found an existing bug that when checking txn objects for congestion, it doesn't check if the transaction contains shared object or not.

Test plan

The test created in this PR.

How did you test the new or updated feature?

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Release notes

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Name	Status	Preview	Comments	Updated (UTC)
sui-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 19, 2024 8:09pm

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