Documentation: add a new file documenting multigrain timestamps

Add a high-level document that describes how multigrain timestamps work,
rationale for them, and some info about implementation and tradeoffs.

Reviewed-by: Josef Bacik <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Tested-by: Randy Dunlap <[email protected]> # documentation bits
Signed-off-by: Jeff Layton <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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