pw_build: Install base deps for the GN Python venv
pw_build: Install base deps for the GN Python venv

Some pip packages that do native compilation require 'wheel' to be
installed and available. This needs to occur before the pip invocation
that installs the project requirements.

This CL adds a new subtarget to run 'pip install wheel' that occurs
before _install_3p_deps.

Change-Id: Ia815ec4d09b5bc03904b9bd329f4b92f65ee3eaf
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/102913
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Pigweed-Auto-Submit: Anthony DiGirolamo <4cc40125edc24ec5bc72df7917ea0b403ee8cebe@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed