Remove builder from setup.py

[ashao]

The builder module was included in setup.py to allow us to ship the main Redis binaries (not RedisAI) with installs from PyPI. The changes in this PR remove our ability to do this and requires users to build Redis as part of the smart build. This change in behaviour is justified by the following:

• The additional cost/complexity to the user for building Redis is minimal due to the pre-existing need to compile RedisAI.
• Removes the need for different platform-dependent wheels
• Frees the builder module from being a single file to allow convenient import into setup.py.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.97%. Comparing base (d7d979e) to head (795cdf5).
Report is 1 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (d7d979e) and HEAD (795cdf5). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (d7d979e)	HEAD (795cdf5)
	8	2

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #654       +/-   ##
============================================
- Coverage    83.91%   65.97%   -17.94%     
============================================
  Files           83       83               
  Lines         6284     6284               
============================================
- Hits          5273     4146     -1127     
- Misses        1011     2138     +1127     

see 47 files with indirect coverage changes

[ashao]

Note that this was a holdover from a previous PR

[MattToast]

Two small requests, but nothing worth holding approval up over.

LGTM, pending CI!!