refactor: make Contract generic for Compiler and add metadata to CompilerOutput #855

Job	Run time
clippy	43s
docs	1m 18s
doctest	1m 22s
feature-checks	3m 7s
fmt	17s
test stable (ubuntu-latest)	1m 12s
test stable --all-features (ubuntu-latest)	2m 6s
test 1.83 (ubuntu-latest)	1m 10s
test stable (macos-latest)	1m 7s
test stable --all-features (macos-latest)	3m 18s
test 1.83 (macos-latest)	1m 27s
test stable (windows-latest)	2m 40s
test stable --all-features (windows-latest)	4m 21s
test 1.83 (windows-latest)	2m 49s
	26m 57s

Provide feedback