mypy

17f8b313 - [mypyc] Import librt.base64 capsule automatically if needed (#20233)

[mypyc] Import librt.base64 capsule automatically if needed (#20233) Allow primitives to specify the capsule they need via module name such as `librt.base64`. This way we can import the capsule automatically only when there are references to the contents of the capsule in the compiled code. Only make the change for `librt.base64`, but we can also do a similar thing for `librt.internal` in a follow-up PR.