disassociate derives crate from KDF

[borngraced]

disassociate the enums_derive crate from the main KDF codebase and moving it to its own separate repository. The idea is to make enums_derive an independent crate that we can maintain, improve, and potentially publish on crates.io. This will help us manage its development more effectively while also making it available for other projects to use and benefit from.

Tasks

• Extract and merge the derives crate into a new Git repo.
• Update any internal references in the KDF codebase to point to the new location of the crate.
• Optionally, prepare and publish the derives crate on crates.io.
• Ensure that the documentation is updated to reflect the changes, including usage instructions for the new repository.