build

Add checkpoint/_src/futures/BUILD. #15964

Job	Run time
build-export (Python 3.10, jax=newest)	1m 35s
build-export (Python 3.11, jax=newest)	1m 36s
build-checkpoint (Python 3.10, jax=newest)	1m 9s
build-checkpoint (Python 3.11, jax=newest)	1m 7s
build-export (Python 3.12, jax=newest)	1m 39s
build-orbax-model (Python 3.10, jax=newest)	7s
build-checkpoint (Python 3.12, jax=newest)	1m 14s
build-export (Python 3.10, jax=0.4.34)	1m 41s
build-orbax-model (Python 3.11, jax=newest)	6s
build-checkpoint (Python 3.10, jax=0.4.34)	1m 11s
build-export (Python 3.12, jax=nightly)	1m 43s
build-checkpoint (Python 3.13, jax=nightly)	1m 26s
build-orbax-model (Python 3.12, jax=newest)	6s
build-orbax-model (Python 3.10, jax=0.4.34)	4s
build-orbax-model (Python 3.12, jax=nightly)	7s
	14m 51s

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