No chop merge see files ranges in metadata scan

[keith-turner]

When scanning the metadata table for debugging purposes it would be nice to know what the rows are for per file ranges in the metadata table. These rows are currently encoded as base 64, so can not easily see the row when scanning the metadata table. Created a bit of code in jshell to do this in this gist

#3767 is related and maybe this issue and it can have the same solution.