how do i add a dependency with all its features enabled?
It's up to the library author(s) if they want to support such use case.
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For most libraries, features add functionality for very specific use cases, like interoperation with a particular other library. Activating all features will just increase your compile times to little benefit. It may even cause compilation to fail (e.g. a feature not supported for the target, or which requires some external native library or other dependency).
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Features can even be mutually exclusive (they can enable different functionalities under the same API or change the way functions work). It another compile-time error case.
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You have to list them all. There's no shortcut for this.
docs.rs has a Feature Flags in the menu, where you can find what you can enable:
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That is a misuse of features. Sometimes, it is the least bad option, but it is a misuse of features.
A consequence of this is that features should be additive. That is, enabling a feature should not disable functionality, and it should usually be safe to enable any combination of features. A feature should not introduce a SemVer-incompatible change.
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Note that Cargo does have an --all-features flag, commonly used by rustdoc, but it only applies to your crate, not your dependencies.