CLDR-5854 Add-examples-for-relative-dates-and-times

[haytenf]

CLDR-5854

Locale	Before	After
cy
cy
cy
cy
cy
ro
ro
ro		(future-few)
ro
it
it

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true

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[haytenf]

@macchiati @srl295 @btangmu Hello! I've made a new PR for this ticket since the old one was (accidentally) trying to merge to the wrong branch. The main thing I wanted to address is that the casing/context side isn't covered by this implementation for two main reasons (the examples for Romanian in the markdown table show this):

• the pattern I use for some of the examples is MMMMd, and when formatted using the rules for Romanian d comes first, so the capitalization becomes irrelevant
• simple date format produces the date appropriately lowercased for Romanian, which is then formatted with the relative item, so the middle-of-sentence capitalization issue doesn't arise

In terms of just getting examples in for the relative items, however, it may still be useful.

[pedberg-icu]

We might need to make this map dependent on locale. That can be done under CLDR-18025 "Further work on examples for relative dates and times".

[pedberg-icu]

We might want to make this "jm" or "Cm" to use hour cycle prefs based on locale. That can be done under CLDR-18025 "Further work on examples for relative dates and times".