refactor: make Contract generic for Compiler and add metadata to CompilerOutput #831

Job	Run time
feature-checks	3m 6s
clippy	44s
docs	31s
doctest	1m 5s
fmt	11s
test stable (ubuntu-latest)	1m 4s
test stable --all-features (ubuntu-latest)	2m 6s
test 1.70 (ubuntu-latest)	39s
test stable (macos-latest)	1m 32s
test stable --all-features (macos-latest)	2m 21s
test 1.70 (macos-latest)	49s
test stable (windows-latest)	4m 15s
test stable --all-features (windows-latest)	5m 0s
test 1.70 (windows-latest)	3m 52s
	27m 15s

Provide feedback