Add flags to bsdiff main to generate the Endsley format.

This patch adds a format flag option in bsdiff main program to
support generating a patch in Endsley format from the command line.
This is helpful to generate patches for performance analysis of the
different settings and patch formats.

Bug: 71854816
Test: Ran bsdiff with --format=endsley

Change-Id: Iba4a3beb4b4cbb82ea1bd5b64d229b1aad871b37