Indexers Speed-ups: Implement LRU Caching and Incremental Updates

[will-bitlight]

This PR implements the IndexerCache functionality with LRU cache management for both Esplora and Electrum indexers. It also introduces incremental update mechanisms to optimize performance and reduce network requests.

• Indexers speed-ups #64

Key Changes:

1. IndexerCache Implementation:

   • Added LRU-based caching to Indexer structures for efficient memory management.
   • Cache primarily stores transaction data, and address history.

2. Optimization of update/create method:

   • WalletCache now primarily uses cached data, falling back to API requests for cache misses.

3. Incremental Update Implementation:

   • Electrum Indexer:
     • Utilizes blockchain.scripthash.get_history for incremental updates.
     • Caches the last history response for each address to determine changes.
   • Esplora Indexer:
     • Uses /address/:address endpoint to fetch aggregated transaction information.
     • Compares local cached aggregates with server data to determine necessary updates.

4. Code Refactoring:

   • Significant reduction of duplicate code in indexer implementations.
   • Encapsulated common functionality for better maintainability.

5. Performance Improvements:

   • Reduced redundant network requests.
   • Faster data access through caching.
   • Incremental update strategy, processing only new transactions.

6. API Compatibility:

   • Maintained existing function signatures for consistency.

Testing:

• Local lib-testing and bin-testing shows expected behavior and performance improvements.

I look forward to your valuable suggestions, I will adjust at any time :)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 599 lines in your changes missing coverage. Please review.

Project coverage is 0.0%. Comparing base (ed03c02) to head (bcfc6c7).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/indexers/electrum.rs	0.0%	286 Missing ⚠️
src/indexers/esplora.rs	0.0%	265 Missing ⚠️
src/cli/args.rs	0.0%	15 Missing ⚠️
src/indexers/cache.rs	0.0%	13 Missing ⚠️
src/data.rs	0.0%	10 Missing ⚠️
src/wallet.rs	0.0%	7 Missing ⚠️
src/indexers/mempool.rs	0.0%	2 Missing ⚠️
src/cli/opts.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #67    +/-   ##
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  Coverage     0.0%   0.0%            
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  Files          23     24     +1     
  Lines        2071   2426   +355     
======================================
- Misses       2071   2426   +355     

Flag	Coverage Δ
rust	0.0% <0.0%> (ø)

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