pw_env_setup: Parse list of optional submodules Parse out "optional_submodules" from the environment config file. Don't do anything with this list yet—downstream projects need to be able to add entries to this list before it starts to be enforced. Change-Id: I590328537ab1b0068b7c734c05a2198b99ec1df0 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/49020 Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Keir Mierle <keir@google.com>
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