<i18n dev> Additional Date-Time Formats

[Naoto Sato]

Updated the CSR based on your inputs.

On 1/27/22 2:34 PM, Stephen Colebourne wrote:
> On Thu, 27 Jan 2022 at 19:23, Naoto Sato <naoto.sato at oracle.com> wrote:
>> Now come to think of it, I came up with the draft based on `ofPattern()`
>> methods. One of them is a overload method that takes a Locale argument.
>> Why is it so?
> 
> There is a case for the Locale on the static method (as a convenience,
> and to remind callers that the locale matters). But there is no case
> for it on the builder.

Eliminated the overload with locale. Instead, added a static method 
DateTimeFormatterBuilder.getLocalizedDateTimePattern() that take 
"requestedTemplate". Also, renamed `appendLocalizedPattern` to 
`appendLocalized` to make it an overload method to the existing one.

> 
>>> The spec Javadoc doesn't explain what repeating the pattern letter
>>> actually does/means. Is "M" the same as "MMMM"?
>>
>> That depends on the locale and the availability of the formats. For
>> example, 'M' translates into these patterns in each locale with
>> Gregorian calendar:
>>
>> https://unicode-org.github.io/cldr-staging/charts/40/by_type/date_&_time.gregorian.html#959cbb42bb2962f
> 
> As things stand, the Javadoc isn't a standalone spec. I don't know how
> much that matters, but I think there should be some indication in
> Javadoc as to why the letter should be repeated.

Added a description that explains the number of pattern letters. They 
follow the same presentation rule as in the pattern chart.

Naoto