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Add bindings to backup & restore wallet #26

Job	Run time
build_feature_electrum (linux)	2m 18s
build_no_default_features (linux)	2m 6s
build_feature_electrum (windows)	6m 2s
build_no_default_features (windows)	5m 21s
build_all_features (nightly, linux)	2m 31s
build_feature_electrum (macos)	2m 19s
build_no_default_features (macos)	2m 34s
build_feature_esplora (linux)	2m 5s
build_all_features (nightly, windows)	5m 50s
build_feature_esplora (windows)	5m 58s
build_feature_esplora (macos)	2m 15s
build_all_features (nightly, macos)	3m 14s
build_all_features (stable, linux)	2m 22s
build_all_features (stable, windows)	5m 21s
build_all_features (stable, macos)	2m 44s
build_all_features (1.77.0, linux)	2m 35s
build_all_features (1.77.0, windows)	5m 55s
build_all_features (1.77.0, macos)	2m 47s
	1h 4m 17s

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