Add ICA-based signature verification for cascade actions

[akobrin1]

• Adds support for verifying signatures on actions submitted via ICA (app_pubkey), with a fallback to on-chain verification.
• Refactors cascade signature verification logging to reuse base log fields via logtrace.WithFields.
• Lowers P2P worker shutdown logs from ERROR to INFO to reduce noise.
• Updates tests and gomock usage to match external lumera mocks; fixes keyring signing call signature.

[roomote]

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The PR implements ICA-based signature verification for cascade actions with proper fallback to on-chain verification. The changes include:

• New ICA signature verification logic in SDK and supernode cascade modules
• Refactored logging to use logtrace.WithFields for cleaner field merging
• P2P worker shutdown logs changed from ERROR to INFO (appropriate for graceful shutdown)
• New AccountByAddress and QueryTxsByEvents methods in auth/tx modules
• Good test coverage for the new ICA verification paths

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[Copilot]

Pull request overview

This PR adds support for verifying signatures on actions submitted via ICA (Interchain Accounts) using an app_pubkey field, with fallback to on-chain verification. The implementation includes comprehensive refactoring of cascade signature verification, test infrastructure improvements, and dependency updates.

Key changes:

• Adds ICA-based signature verification using app_pubkey with fallback to on-chain verification
• Refactors cascade signature verification to use reusable base log fields via logtrace.WithFields
• Updates test infrastructure to disable state sync and improve supernode logging
• Migrates from github.com/golang/mock to go.uber.org/mock

Reviewed changes

Copilot reviewed 56 out of 61 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tools/tools.go	Adds build tag for gomock tool dependency management
tests/system/system.go	Adds state sync disabling in test configs
tests/system/supernode-utils.go	Adds supernode log file capture to disk
tests/system/go.mod/go.sum	Updates Go version, dependencies, and adds ICA test support
tests/system/e2e_cascade_test.go	Adds comprehensive ICA E2E test flow with signature verification
tests/integration/securegrpc/secure_connection_test.go	Updates gomock import path
supernode/cascade/register.go	Passes app_pubkey to signature validation
supernode/cascade/ica_verify.go	New file implementing ICA signature verification logic
supernode/cascade/ica_verify_test.go	New tests for ICA signature verification
supernode/cascade/helper.go	Refactors to use new signature verifier builder
supernode/cascade/download.go	Adds ICA signature verification for downloads with improved logging
sdk/task/manager.go	Adds PublishEvent method
sdk/task/task.go	Improves supernode rejection logging
sdk/task/helpers.go	Adds ICA signature validation with fallback logic
sdk/task/cascade.go	Adds logging for zero eligible supernodes
sdk/event/types.go	Adds SDKMetadataICASigned event type
sn-manager/go.mod	Updates Go version and dependencies

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