Add bazel build for core gz sim library (no gui, physics, systems) #1

Job	Run time
test / matrix-prep-os	3s
test / matrix-prep-bazelversion	8s
test / test (ubuntu-latest, 8.0.0, ., true)	5m 42s
test / test (ubuntu-latest, 7.3.1, ., true)	5m 41s
	11m 34s

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