Add documentation or script for creating UEFI python build

[crass]

Based on reading the build documentation for UEFI Python the prebuilt UEFI Python in this repo probably needed to have non-default modules configured to be built in. Please provide a script or documentation on how this prebuilt was generated.

Blibbet on the mailing list posted 3 years ago pretty sums up my thoughts on this:

Wasn't there some special CHIPSEC-centric options needed to build Python
with? If so, that should be clarified better in build docs.

(Granted, it sucks having a security tool ship a pre-compiled Python
binary in their source tree, built in an unknown manner, with no
checksums, and no reproducable builds, and have the tool rely on this
for determining platform security. But that's another issue...)

[npmitche]

@Sae86 Can you document the process when you find the time to go through it?