Original title: Investigate changes in SERVER-73402: timelib support for additional format specifiers

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Added %b and %B format specifiers to $dateToString, which return the three-letter name of the month (ex. "Jan") and the full name of the month (ex. "January") respectively. These will be returned in TitleCase, and the user can use $toUpper or $toLower to adjust capitalization as needed.

Description of Linked Ticket

We want to add additional format specifiers to the timelib library, to create symmetry between dateFromString and dateToString; all format specifiers supported by one, should be supported by the other. This means adding %b and %B in dateToString, and %U and %w in dateFromString.