Allow explicit passing of plural name to new_class instead of suffix

[jacobtomlinson]

Reverts #392
Closes #402

In #392 I added support for specifying the plural_suffix in new_class. This was done because previously it just assumed the plural form added an s suffix (pod => pods). In #391 an example was given where the suffix should be es (ec2nodeclass => ec2nodeclasses), so I added the ability to modify the suffix.

However since then I found an example where we don't simply add a suffix, but instead replace the last letter with a suffix (policy => policies).

This PR reverts the ability to modify the suffix and instead gives the ability to specify the entire plural. This makes things less "clever" and hopefully solves other edge cases we haven't thought of yet.

from kr8s.objects import new_class

MyPolicy = new_class(
        kind="MyPolicy",
        plural="MyPolicies",
        version="newclass.example.com/v1",
        namespaced=True,
    )

Plural is still optional though, and if you omit it then we just assume the plural form appends an s to the singular.

This change is slightly breaking because I opted to replace the plural_suffix with just plural rather than allow both. But the impact should be low because it is a very new addition and I expect few users will have adopted it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.29%. Comparing base (87063fc) to head (8db9e27).
Report is 106 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
+ Coverage   94.61%   95.29%   +0.67%     
==========================================
  Files          29       29              
  Lines        3141     3574     +433     
==========================================
+ Hits         2972     3406     +434     
+ Misses        169      168       -1     

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