Stubs aren't analyzed before their modules

[jakebailey]

This affects PyQt5 pretty heavily.

This module has a stub next to it, which was added to the module by TryCreateModuleStub, but this stub was never analyzed (the state is at Analyzing) and has an empty analysis. This leaves the LS to spend all its in the ModuleSymbolTable with 30k+ evaluators to process.

[jakebailey]

The underlying issue for PyQt5 actually seems to be the size; we'll probably start treating library stubs specially to help this (but this issue still stands).

[AlexanderSher]

No repro so far. Feel free to reopen it if you see it.