Add bazel build for core gz sim library (no gui, physics, systems) (#… #5

Job	Run time
test / matrix-prep-os	3s
test / matrix-prep-bazelversion	7s
test / test (ubuntu-latest, 7.3.1, ., true)	30m 59s
test / test (ubuntu-latest, 8.0.0, ., true)	31m 3s
	1h 2m 12s

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