pw_build: Tool for generating a BUILD.gn for Python
pw_build: Tool for generating a BUILD.gn for Python

Generates a BUILD.gn file with a pw_python_package entry for a Python
package.

Change-Id: I27d7d8be070bb4d5508a214d5a86cd3861a9f450
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/22202
Commit-Queue: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Reviewed-by: Alexei Frolov <a1b001416a8cf9aaea32a3411f8f3c0793ebc0b5@google.com>

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