Add assert to castTo

[HosseinYousefi]

Alternative considered:

Instead of assertion, we could add a unsafe = false named parameter to castTo and throw an JClassCastError instead.

Reason against going with it: This forcefully adds a call to instanceof but with assertion, we don't have any overhead in production while still getting the benefit while development.

Closes #986.

[github-actions]

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pkgs/ffigen/lib/src/config_provider/config_spec.dart
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[coveralls]

coverage: 92.009% (-1.7%) from 93.677%
when pulling 4a85625 on safe-cast
into 71ada4b on main.

[dcharkes]

lgtm! 🌞