ranges have previously been consolidated by having overlapping ranges be
combined, resuting in a (possibly) consolidated set of ranges, which
are now ordered by start and end dates.
Add a transducer step to walk those ranges and find any pairs of ranges
where the pair of ranges abutt each other, and combine them into
a single range.
transduce over the ordered range values starts and ends and do the
stack push/pop matching over the start and end values to consolidate
the overlapping ranges and result in a new set of consolidated and
sorted range values.
