Build

Add bindings to backup & restore wallet #32

Job	Run time
build_feature_esplora (linux)	48s
build_feature_electrum (linux)	46s
build_all_features (nightly, linux)	44s
build_feature_esplora (windows)	3m 22s
build_feature_electrum (windows)	2m 50s
build_all_features (nightly, windows)	4m 19s
build_feature_esplora (macos)	1m 3s
build_feature_electrum (macos)	1m 8s
build_all_features (nightly, macos)	1m 3s
build_no_default_features (linux)	38s
build_all_features (stable, linux)	47s
build_no_default_features (windows)	2m 56s
build_all_features (stable, windows)	3m 56s
build_no_default_features (macos)	46s
build_all_features (stable, macos)	50s
build_all_features (1.77.0, linux)	54s
build_all_features (1.77.0, windows)	2m 16s
build_all_features (1.77.0, macos)	1m 4s
	30m 10s

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