Add memory wallet

[thunderbiscuit]

I almost can't believe we get this for free now that the generic on the Wallet type has been removed.

Don't merge, needs actual testing. My main concern would be that certain methods don't work on the memory wallet, but that should be captured at compile time, so... are we just getting away with it with such simple changes? It's too good to be true.

Changelog notice

Added
  - New memory wallet [#528]

[#528]: https://github.com/bitcoindevkit/bdk-ffi/pull/528

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

[coderabbitai[bot]]

Walkthrough

The updates across various modules of the Bitcoin Development Kit (BDK) primarily focus on enhancing wallet synchronization and address management. Key changes include the introduction of FullScanRequest and SyncRequest to standardize full scan and sync operations, the replacement of get_address with reveal_next_address for address retrieval, and the addition of error handling improvements. These modifications aim to streamline processes and improve the robustness of the wallet functionalities.

Changes

File Path	Change Summary
.../LiveTxBuilderTest.kt, .../LiveWalletTest.kt, .../OfflineWalletTest.kt	Introduced FullScanRequest for initiating scans, updated address retrieval to revealNextAddress, and added wallet commit operations after updates.
bdk-ffi/src/..., bdk-jvm/lib/src/test/kotlin/..., bdk-python/tests/..., bdk-swift/Tests/...	Added FullScanRequest and SyncRequest, updated method signatures and error handling, and standardized address retrieval across different language bindings.
bdk-ffi/src/error.rs, bdk-ffi/src/wallet.rs	Enhanced error handling with new error types and updated method signatures for better clarity and functionality.
bdk-ffi/src/esplora.rs, bdk-jvm/lib/src/test/kotlin/LiveTxBuilderTest.kt	Modified full_scan method to take FullScanRequest, and updated synchronization logic. Changed network from TESTNET to SIGNET in JVM tests.

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[thunderbiscuit]

@reez I have tested those locally with all our JVM tests by turning them into memory wallets and all tests passed. Ready for review.

[thunderbiscuit]

@reez this is ready for final review. I rebased #535 onto this one, so if you can review this one first we'll merge that and then look at the electrum client.