feat(accounts): Add Query to simulate a UserOperation

[testinginprod]

Description

SimulateUserOperation can be used by Bundlers to simulate the outcome of the execution of a UserOp.

The rationale for not using SimulateTX is to give granularity over the operation itself.

If we were to simulate a TX the bundler would most likely receive a response with more information pertaining the execution of the TX and not the operation itself. This also removes burden from the state machine to execute a full tx when only the op is needed.

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[coderabbitai]

Walkthrough

The recent modifications involve enhancing the Cosmos blockchain's account system by introducing account abstraction capabilities. A new RPC method, SimulateUserOperation, has been added to the Query service for simulating user operations. Accompanying this are new request and response message types and a test case for ensuring the simulation's correctness, including gas usage and error handling. The queryServer struct now supports this simulation with appropriate gas limit settings.

Changes

File(s)	Change Summary
proto/cosmos/accounts/v1/query.proto	Introduced import of account_abstraction.proto and added SimulateUserOperation RPC method with new message types for request and response.
tests/e2e/accounts/.../account_abstraction_test.go	Added a test case for simulating user operations, checking gas usage and error handling.
x/accounts/query_server.go	Updated queryServer struct with gas limit constants and implemented SimulateUserOperation method.

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[github-actions]

@testinginprod your pull request is missing a changelog!

[tac0turtle]

how come this is needed over the global simulation method?

[tac0turtle]

explained the need in a call. Can you update the pr description so readers know the reason for this feature @testinginprod