* WASM: prevent filesystem access
* Exclude logger module on wasm
* Drop use of conditional compilation in `LiquidOnchainWallet`
* Expose `LiquidSdkBuilder` and configure build for wasm
* Move working_dir setup and log header to connect with signer
* Add in memory persister constructor
* Drop builder connect method
* Remove `empty_wallet_cache` from WASM interface
* Impose custom persister on wasm