40.0.0-ALPHA3

⚠️ PRE RELEASE 🚧

see #28

tagged as and and published to npm as 40.0.0-ALPHA3

cldr-staging release-40-alpha3
cldr maint-40 + CLDR-14642 cldr-json: skip en-US-u-va-posix cldr#1498

Migration:

• new package cldr-bcp47 with bcp47 metadata
• also, bcp47 filename usage: see unicode-org/cldr#1494 (comment) for migration