Tests

docs: add docs for `starknet-accounts` #1384

Job	Run time
Unix tests (ubuntu-latest, stable)	2m 0s
Unix tests (ubuntu-latest, nightly)	2m 13s
Unix tests (macos-12, stable)	2m 47s
no-std build	43s
Unix tests (macos-12, nightly)	2m 37s
WASM tests	3m 45s
Windows tests (stable, x86_64-pc-windows-gnu)	4m 58s
Windows tests (stable, x86_64-pc-windows-msvc)	3m 59s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 21s
Windows tests (nightly, x86_64-pc-windows-msvc)	4m 36s
	31m 59s

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