Addition of Chow ring ideal and Chow ring classes

[25shriya]

This PR is focused on addition of classes for Chow ring ideal and Chow ring of matroids.
Check relevant issue.
The ideals classes consist of the Chow ring ideal and Augmented Chow ring ideal, with Gröbner basis for each of them.

The Chow ring class is an initial version.
@tscrim

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

⌛ Dependencies

[github-actions]

Documentation preview for this PR (built with commit a7eec7b; changes) is ready! 🎉
This preview will update shortly after each push to this PR.

[tscrim]

Some little details, but the biggest thing in the multiplication table doctest is now failing. Likely this is due to different gens().

[tscrim]

LGTM. If we find any issues later on, we can fix them at that point.

[vbraun]

On 32-bit Linux:

**********************************************************************
File "src/sage/matroids/chow_ring_ideal.py", line 660, in sage.matroids.chow_ring_ideal.AugmentedChowRingIdeal_atom_free._gens_constructor
Failed example:
    ch.defining_ideal()._gens_constructor(ch.defining_ideal().ring())
Expected:
    [A0*A1, A0*A2, A1*A2, A0^2 + 2*A0*A3 + A3^2, A1^2 + 2*A1*A3 + A3^2,
     A0*A1 + A0*A3, A2^2 + 2*A2*A3 + A3^2, A0*A2 + A0*A3,
     A0*A1 + A1*A3, A1*A2 + A1*A3, A0*A2 + A2*A3, A1*A2 + A2*A3]
Got:
    [A0*A1,
     A0*A2,
     A1*A2,
     A2^2 + 2*A2*A3 + A3^2,
     A0*A2 + A0*A3,
     A1^2 + 2*A1*A3 + A3^2,
     A0*A1 + A0*A3,
     A0^2 + 2*A0*A3 + A3^2,
     A1*A2 + A1*A3,
     A0*A1 + A1*A3,
     A1*A2 + A2*A3,
     A0*A2 + A2*A3]
**********************************************************************

[tscrim]

Curious. It seems one of the iterator is machine dependent.

@25shriya Just run a sorted on the output (probably best to do this for all outputs of _gens_constructor…)

[tscrim]

That should fix the issue.