New Presplit utility for Fate table

[ArbaazKhan1]

closes issue #4979

Added support for pre-splitting Fate tables via accumulo admin command.

• --numSplits option generates split points using the same partitioning logic as in FateManager.getDesiredPartitions. The logic ensures that pre-split boundires align with how the manger expects transaction IDs to be distributed. The split utility produces raw UUID row strings which should allow it be also be used by scan_ref.

• --splitsFile flag writes the generated splits to a file.

[DomGarguilo]

Suggested change

	@Parameter(names = {"-n", "--numSplits"},
	description = "Generate N split points for the fate table and print to stdout. N should always be greater than 1.")
	@Parameter(names = {"-n", "--num-splits"},
	description = "Generate N split points for the fate table and print to stdout. N must be >= 1.")

[DomGarguilo]

I usually try not to nest constructors in a try-with-resources block. Usually things work out okay but putting each object constructed on its own line makes it more certain that each object will be cleaned up properly in the try-with-resources block as opposed to relying on the closure of the outmost object to cascade down and close the rest.

[DomGarguilo]

Suggested change

	int numSplits = 1;
	int numSplits = -1;

I think we need to default to -1 here so that split generation is opt-in. If we leave it as 1, every fate invocation takes the numSplits > 0 branch and returns before normal commands like --print, --cancel, etc. can run