Clean up the algebra crate

[JoeyBF]

This PR implements 3 related changes:

• We remove the SteenrodAlgebraT traits (resolves Removing SteenrodAlgebraT traits #77)
• We replace the manual dispatch with macros with enum_dispatch. We used to do that, but it was reverted in ff7d720, because enum_dispatch was causing issues. The current version does not have those issues anymore.
• We remove polynomial algebras, which were both completely untested and unused, and tend to cause problems with conflicting implementations, particularly impl<A: PolynomialAlgebra> Algebra for A.

[Copilot]

Pull Request Overview

This PR cleans up the algebra crate by simplifying the trait hierarchy and removing unused code. The changes modernize the codebase by replacing manual dispatch with enum_dispatch macros and eliminating untested functionality.

• Removes SteenrodAlgebraT traits that were originally used for Python bindings
• Replaces manual dispatch macros with enum_dispatch for better performance and code generation
• Removes polynomial algebras which were completely untested and unused

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
steenrod_algebra.rs	Removes trait implementations and manual dispatch, adds enum_dispatch attribute
polynomial_algebra.rs	Complete removal of polynomial algebra implementation
pair_algebra.rs	Adds comment explaining why enum_dispatch cannot be used
mod.rs	Updates exports to remove deleted traits and polynomial algebra types
milnor_algebra.rs	Removes MilnorAlgebraT trait
bialgebra_trait.rs	Adds enum_dispatch attribute
algebra_trait.rs	Adds enum_dispatch attributes and removes manual dispatch macro
adem_algebra.rs	Removes AdemAlgebraT trait
Cargo.toml	Adds enum_dispatch dependency