Implement recommended traits on public structs

[wizenink]

Resolves #17

[gemini-code-assist]

Summary of Changes

Hello @wizenink, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the ergonomics and idiomatic usage of various core data structures and enums by implementing or deriving essential Rust traits. By adding traits like Debug, Clone, PartialEq, Eq, Hash, and Default, these types become more versatile for debugging, comparison, cloning, and use in collections, aligning them better with standard Rust practices and resolving issue #17.

Highlights

• Trait Derivations: Added Debug, Clone, PartialEq, Eq, Hash, and Default trait derivations to numerous public structs and enums across the codebase, enhancing their usability and debuggability.
• FftBackend Debuggability: The FftBackend trait now requires the core::fmt::Debug trait, and a custom Debug implementation was added for RustFftWrapper to support this.
• MicroFFT Backend Types: The Complex<T> struct for the microfft-backend feature now derives Default, and MicroFftForward and MicroFftInverse structs now derive Debug and Clone.

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[gemini-code-assist]

Code Review

This pull request systematically implements recommended traits such as Debug, Clone, PartialEq, Eq, Hash, and Default across the public structs and enums in the crate. The changes are consistent, correct, and significantly improve the ergonomics and usability of the library, especially for testing and debugging. The choice of which traits to implement for each type is appropriate, correctly handling types with generics and trait objects. The implementation is clean and I have no issues to report.