WIP: Backport bazel_* plugins from bst-plugins-experimental

Tom Coldrickrequested to merge
coldtom/bazel into master

Adds a backport of the bazel_build, bazel_source plugins from bst-plugins-experimental.

I still need to make sure these work yet though. (I suspect bazel_build will need changes to create /dev/shm)

Edited by Tom Coldrick

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