Handle arbitrary module names and modules objects in require_compat()

[khaeru]

As described.

PR checklist

• Checks all ✅
• Update documentation
• Update doc/whatsnew.rst

[codecov-commenter]

Codecov Report

Merging #63 (8753052) into main (c5a198c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #63   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        38           
  Lines         2796      2809   +13     
=========================================
+ Hits          2796      2809   +13     

Impacted Files	Coverage Δ
genno/core/computer.py	100.00% <100.00%> (ø)
genno/tests/core/test_computer.py	100.00% <100.00%> (ø)

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