fix: staking optimization v1.6.x patch

[randy-cro]

Description

Previous staking optimizations were causing AppHash mismatches across nodes.
To address this issue, two key changes were introduced:

1. Use of an in-memory KV store to manage staking caches.
   Reference

2. Implementation of fixed gas consumption for staking-related messages to ensure consistent gas usage.
   Reference

⚠️ Version Note:
As this is a v1.5 patch, all staking-related operations will be rejected at the antehandler level.
This serves as a warning for node operators about potential AppHash mismatches due to inconsistent gas consumption.

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/staking-optimization-1.5.x-patch

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	golang/​github.com/​randy-cro/​ethermint@​v0.0.0-20251121092340-5ac5695a0c80
	golang/​google.golang.org/​grpc@​v1.75.0 ⏵ v1.75.1	+1
	golang/​google.golang.org/​protobuf@​v1.36.8 ⏵ v1.36.10	+1
	golang/​github.com/​randy-cro/​cosmos-sdk@​v0.0.0-20251121082545-b3fa9253c274
	golang/​github.com/​cosmos/​gogoproto@​v1.7.2
	golang/​github.com/​spf13/​pflag@​v1.0.6 ⏵ v1.0.10
	golang/​github.com/​spf13/​viper@​v1.20.1 ⏵ v1.21.0	+1
	golang/​github.com/​spf13/​cast@​v1.9.2 ⏵ v1.10.0

View full report

[thomas-nguy]

why is there so many dependency updates?