MudAutocomplete: add InputClass

[danielchalmers]

Description

Like #7596. Closes #4940. And closes #4926 because we don't want more Style properties.

How Has This Been Tested?

unit

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.13%. Comparing base (af7d684) to head (a08601a).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10064   +/-   ##
=======================================
  Coverage   91.12%   91.13%           
=======================================
  Files         410      410           
  Lines       12456    12459    +3     
  Branches     2419     2419           
=======================================
+ Hits        11351    11354    +3     
  Misses        560      560           
  Partials      545      545           

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