fix: define missing Anopheles cache-name properties

[Flamki]

What problem does this solve?

roh_hmm(), ihs_gwss(), and xpehh_gwss() can hit abstract cache-name properties that are not implemented in all Anopheles subclasses, leading to NotImplementedError during use.

How does it solve it?

• Adds concrete cache-name constants/properties to all four subclasses:
  • Ag3: add _roh_hmm_cache_name
  • Af1: add _roh_hmm_cache_name
  • Amin1: add _xpehh_gwss_cache_name, _ihs_gwss_cache_name, _roh_hmm_cache_name
  • Adir1: add _xpehh_gwss_cache_name, _ihs_gwss_cache_name, _roh_hmm_cache_name
• Adds regression test tests/test_anopheles_cache_names.py to enforce these subclass property definitions.

Relevant issue

Fixes #900

Testing done

• pytest -q tests/test_anopheles_cache_names.py -vv
• Result: 4 passed

Breaking changes / migration notes

• None.