ref(dates): adjust date interface

[natemoo-re]

Refactors #448 to simplify public interface and clean up the split between core and prompts

Overview of changes:

• format now uses Y M D to avoid ambiguity with Unicode LDML date formats
• keyboard behavior more closely matches <input type="date">
  • digits fill right to left
  • navigation is per-segment
  • new digits wipe old digits
  • prompt accepts locale, defaults to locale-aware format

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5357d2b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes changesets to release 2 packages

Name	Type
@clack/prompts	Minor
@clack/core	Minor

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[dreyfus92]

awesome job nate 😄, left just a couple of comments 👀 also don't forget about adding a changeset

[natemoo-re]

Updated! I don't have a specific changeset here since #448 already added one for the new date prompt. We haven't released that so there's no user-facing change in this PR.