Refactor RPC client to use interface

[iuwqyir]

TL;DR

Refactored RPC client interface and updated related components for improved modularity and testability.

What changed?

• Introduced IRPCClient interface in rpc.go to abstract RPC client functionality.
• Updated Client struct to implement IRPCClient interface.
• Modified Initialize() function to return IRPCClient instead of *Client.
• Refactored Orchestrator, ChainTracker, Committer, FailureRecoverer, Poller, ReorgHandler, and Worker to use IRPCClient interface.
• Moved GetLatestBlockNumber() method from Poller to Client.
• Updated method calls and field accesses throughout the codebase to use the new interface.

How to test?

1. Ensure indexing works after the refactoring.

Why make this change?

This refactoring improves the codebase by:

1. Enhancing modularity and separation of concerns.
2. Facilitating easier testing by allowing mock implementations of IRPCClient.
3. Improving code maintainability and readability.
4. Providing a clearer contract for RPC client functionality.
5. Enabling easier future extensions or modifications to the RPC client implementation.

[iuwqyir]

• Test setup and reorg handling tests #95
• Refactor RPC client to use interface #94 👈
• Add reorg handler functionality and configuration options #91
• Create storage functions for handling reorgs #90
• Refactor data insertion logic  #89
• Refactor rpc for easier reuse #88
• main

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[iuwqyir]

Merge activity

• Oct 10, 10:01 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Oct 10, 10:12 AM EDT: Graphite rebased this pull request as part of a merge.
• Oct 10, 10:13 AM EDT: A user merged this pull request with Graphite.