Prepare soong for python 3.11

Due to upstream changes in python path calculations, I'm simplifying the
python launcher to work more like a standard python distribution. This
is effectively changing the stdlib path from `internal/stdlib` to
`internal/python3.10` (or `3.11`, etc). This allows us to specify the
zip file as PYTHONHOME, set PYTHONPLATLIBDIR to `internal` and use the
default detection after that.

That does mean during upgrades that the stdlib pkg path will change, so
move the source vs prebuilt calculation from the Android.bp into Soong
to choose which stdlib module to pick up (with the corresponding
`pkg_path`)

Bug: 278602456
Test: treehugger with python3.10
Test: a python3.11 source + 3.10 prebuilt build
Test: a python3.11 source+prebuilt build
Change-Id: I8b02e7b22a1f1d1e02819ae1a31a99cdc985542c