Refactor base class

[jcapriot]

This refactor is aimed at increasing consistency throughout the package, adding a few bits of missing information.

• Gets rid of the ugly set_kwargs funciton.
• Automatically do a check for symmetry and hermitian, if not given.
• Exposes a solve() operation that broadcast's like np.linalg.solve.
• Uses Scipy's triangular solver for Forward and Backward class (and makes them transposes of each other).
• Check's wrapped function signatures for valid keyword arguments.
  • Emits warnings on unused keyword arguments.
• add a solver.transpose() method, which is aliased as a property as solver.T.
• Define's Base as an abstract class, where subclasses must implement a _solver_single and a _solve_multiple.
• Mimic's scipy's more recent rtol and atol keywords for solution checking.
• Add __matmul__, __rmatmul__, and __rmul__ operations.

[codecov]

Codecov Report

Attention: Patch coverage is 99.45355% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.62%. Comparing base (089e975) to head (5047329).
Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
pymatsolver/solvers.py	99.09%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   91.71%   99.62%   +7.91%     
==========================================
  Files           7        7              
  Lines         374      531     +157     
==========================================
+ Hits          343      529     +186     
+ Misses         31        2      -29     

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