lei import|tag|rm: support --commit-delay=SECONDS

Delayed commits  allows users to trade off immediate safety for
throughput and reduced storage wear when running multiple
discreet commands.

This feature is currently useful for providing a way to make
t/lei-store-fail.t reliable and for ensuring `lei blob' can
retrieve messages which have not yet been committed.

In the future, it'll also be useful for the FUSE layer to batch
git activity.

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