feat: Add DateTimePicker component

[GuillaumeRx]

Adds a new DateTimePicker component

---

Note

Introduces a new DateTimePicker JSX component (with ISO 8601 validation), adds simulation/Jest support via pickDateTime, integrates in controllers/state, and showcases it in the interactive UI example.

• SDK / JSX:
  • Add DateTimePicker component (jsx/components/form/DateTimePicker.ts) with tests and validation (DateTimePickerStruct).
  • Introduce ISO8601DateStruct in internals/time (using luxon) and export via SDK; update validation to use it.
  • Update Field and form typings/exports to include DateTimePicker.
  • Add luxon dependency and types.
• Controllers:
  • Treat DateTimePicker as stateful in interface utils; support default/state construction in forms and root.
• Simulation / Jest:
  • Add pickDateTime action across simulation API and handler interfaces; wire events/state updates; extensive tests.
  • Expose pickDateTime in Jest helpers and mock interface responses.
• RPC Methods:
  • Extend snap_createInterface validation/error messages to allow DateTimePicker.
• Examples:
  • Update interactive UI example to include Date/Time/DateTime pickers and tests asserting ISO strings.
• Execution Environments:
  • Update LavaMoat policies to allow @metamask/snaps-sdk>luxon and Intl.
• Utils:
  • Move ISO date validation to SDK; snaps-utils/time now re-exports ISO8601DateStruct and retains duration utilities.
• Manifests/Lockfile:
  • Update example snap shasum; lockfile reflects new luxon and types.

^{Written by Cursor Bugbot for commit 85563a0. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (9392ef9) to head (85563a0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3698   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files         418      420    +2     
  Lines       12186    12211   +25     
  Branches     1887     1889    +2     
=======================================
+ Hits        11977    12002   +25     
  Misses        209      209           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.