[lldb] Emit type annotation in SWIG generated Python code.

The Python code generated by SWIG is compatible with both Python 2 and
Python 3. The -py3 option enables Python 2 incompatible features such as
function annotations and abstract base classes.

Differential revision: https://reviews.llvm.org/D96096

GitOrigin-RevId: e5228ef556e5a4cb40c6c7936aada636e1b7be10
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