fix(bitcoind_rpc): fix filter iter may not handle reorgs properly

[Musab1258]

Description

This PR fixes FilterIter not handling reorgs properly as stated in this issue #1848

Notes to the reviewers z

The code in this fix detects reorgs by checking if the previous_block_hash matches the hash of the previous block in the chain. It then finds the last common block between the old and new chains with the find_fork_point method. And resets the iterator's state to the fork point(i.e. point of reorg) and resume scanning from the new chain.

I also added tests to simulate a reorg and verifythat the iterator correctly switches to the new chain

Changelog notice

Checklists

All Submissions:

• [x] I've signed all my commits
• [x] I followed the contribution guidelines
• [x] I ran cargo fmt and cargo clippy before committing

New Features:

• [ ] I've added tests for the new feature
• [ ] I've added docs for the new feature

Bugfixes:

• [ ] This pull request breaks the existing API
• [ ] I've added tests to reproduce the issue which are now passing
• [x] I'm linking the issue being fixed by this PR