chore: reexport `electrsd` in `TestEnv` #80

Job	Run time
Check WASM	57s
Build and test (stable, true, --no-default-features)	2m 27s
Build and test (stable, true, --all-features)	2m 47s
Build and test (1.63.0, --no-default-features)	6m 11s
Build and test (1.63.0, --all-features)	6m 9s
Check no_std	27s
clippy_check	56s
Rust fmt	8s
	20m 2s

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