make_class(): Add "__annotations_" to generated class

[sscherfke]

Fixes: #1271

Summary

make_class() populates the __annotations__ dict of the generated class, so that resolve_types() can resolve the types of the generated class.

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[codspeed-hq]

CodSpeed Performance Report

Merging #1285 will not alter performance

_{Comparing make-class-annotations (7a4a6f9) with main (c83de6a)}

Summary

✅ 12 untouched benchmarks

[hynek]

Thanks!