RFR: 8303039: Utilize `coverageLevels.txt`

[Naoto Sato]

On Wed, 1 Mar 2023 23:06:10 GMT, Steven R. Loomis <duke at openjdk.org> wrote:

>> This is a pre-requisite for supporting CLDR v43, where they combine `seeds` locales with `common` locales (https://cldr.unicode.org/index/downloads/cldr-43#h.7s25aqdv767e). In order to have the same coverage level of locales, CLDRConverter tool needs to comb through the locale files based on the `coverageLevels.txt` file, (and the ones we already included as of v42). Confirmed the same set of locales is generated before and after this modification.
>
> make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java line 1212:
> 
>> 1210:                     a -> Locale.forLanguageTag(a[0].trim().replaceAll("_", "-")),
>> 1211:                     a -> a[1].trim(),
>> 1212:                     (v1, v2) -> v2,
> 
> this will grab all listed entries.  Right now, that will get you basic and above.  Ideally you would include if `v1` is one of `(basic|moderate|modern|comprehensive)` — I'm proposing to add `core` or maybe even `undefined` locales in this list (though no consensus yet)

OK, will filter explicitly for those levels.

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PR: https://git.openjdk.org/jdk/pull/12812