[anodized-core] test: use pretty_assertions #717

Job	Run time
Check formatting	6s
Lint test-util	12s
Lint and test anodized-logic	25s
Lint and test anodized-fmt	30s
Lint and test anodized-core	13s
Lint and test anodized with cfg ``	36s
Lint and test anodized with cfg `--config 'build.rustflags=["--cfg","anodized_panic"]'`	37s
Lint and smoke-test fuzz targets	1m 35s
Lint and test anodized with cfg `--config 'build.rustflags=["--cfg","anodized_discard_specs"]'`	36s
Lint and test anodized with cfg `--config 'build.rustflags=["--cfg","anodized_print"]'`	38s
	5m 28s

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