Tests

feat: add `abigen!` macro #889

Job	Run time
WASM tests	8m 15s
WASM tests	8m 2s
Unix tests (ubuntu-latest, stable)	15m 52s
Unix tests (ubuntu-latest, stable)	15m 39s
Windows tests (stable, x86_64-pc-windows-gnu)	22m 11s
Windows tests (stable, x86_64-pc-windows-gnu)	25m 27s
Unix tests (ubuntu-latest, nightly)	15m 49s
Unix tests (ubuntu-latest, nightly)	15m 46s
no-std build	2m 46s
no-std build	2m 46s
Windows tests (stable, x86_64-pc-windows-msvc)	22m 16s
Windows tests (stable, x86_64-pc-windows-msvc)	24m 21s
Unix tests (macos-11, stable)	15m 50s
Unix tests (macos-11, stable)	15m 43s
Unix tests (macos-11, nightly)	15m 51s
Unix tests (macos-11, nightly)	15m 41s
Windows tests (nightly, x86_64-pc-windows-gnu)	20m 55s
Windows tests (nightly, x86_64-pc-windows-gnu)	24m 54s
Windows tests (nightly, x86_64-pc-windows-msvc)	22m 15s
Windows tests (nightly, x86_64-pc-windows-msvc)	24m 15s
	5h 34m 34s

Provide feedback