get duplicate files new output format

[Cedric-Boucher]

returns a tuple of all the files that are duplicated between path1 and path2,
as a tuple of tuples of the filepaths of all matches.
for example: ( (match1, match1, match1), (match2, match2) )

[Cedric-Boucher]

step 1: group files by matching size in bytes
step 2: group files by matching size in bytes AND matching hash of first 1MB
step 3: group files by matching size in bytes AND matching hash of first 1MB AND matching hash of whole file

for steps 2 and 3, only calculate hashes if there are more than 1 file in the group that could potentially match with other files

[Cedric-Boucher]

I updated the string in the actual function header as the output format was incorrect lol, but this is now correct