refactor(hubble): implement Result pattern in OnChainEventStore

[VolodymyrBg]

Why is this change needed?

The current implementation in OnChainEventStore uses direct error throwing in several critical methods, which breaks the established error handling pattern used throughout the codebase. This inconsistency can lead to:
Unpredictable error propagation
Difficulty in proper error handling by calling code
Potential runtime issues when errors are not properly caught
The codebase predominantly uses the Result pattern from the neverthrow library for error handling. This PR aligns the OnChainEventStore implementation with this pattern by:
Refactoring getActiveSigner to return HubResult
Refactoring _mergeEvent to return HubResult
Improving error handling in _handleSignerEvent
Adding proper error context and recovery in cache operations

Merge Checklist

[x] PR title adheres to the conventional commits standard
[x] PR has a changeset
[x] PR has been tagged with a change label: bugfix
[ ] PR includes documentation (not necessary as this is an internal implementation change)

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PR-Codex overview

This PR focuses on enhancing error handling and return types in the OnChainEventStore class methods, transitioning from direct returns to using ResultAsync and err for improved error management.

Detailed summary

• Updated getActiveSigner to return HubResult<SignerOnChainEvent> instead of Promise<SignerOnChainEvent>.
• Implemented error handling using try-catch and returning err for errors in getActiveSigner.
• Changed _mergeEvent to return HubResult<number> and updated error handling to use err.
• Added error handling in the transaction commit process in _mergeEvent.

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