Update project to buildstream 2 and bazel_file
- Modernises buildstream files
- Adds CI utilizing the publicly readable FDSDK cache
- Updates from
bazel_sourceplugin to (not yet merged see mr)bazel_fileplugin. - Builds an both a
WORKSPACEandMODULE.bzlexample. - Uprevs the version of bazel we build from v1.1.0 to v7.3.1
Edited by Harry Sarson