Returns a value generator that returns a string prefix followed by a sequence number, optionally left-padded
with 0 to ensure a correct ordering (for example: CODE_001, CODE_002, etc.). The returned generator starts the
sequence at 1 and increments by 1, and doesn't pad the numbers.
prefix - the prefix before the generated number (for example: "CODE_").
Returns a value generator that returns a sequence of dates, starting at a given date and incremented by a given
time, specified as an increment and a calendar field. The returned generator starts today at 00:00:00
and increments by 1 day by default.