Issue number: resolves #30634

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What is the current behavior?

• enterInputMode/exitInputMode is not available in the datetime picker
• inputMode status updates are not available

What is the new behavior?

• New event: inputModeChanged on ion-datetime with payload { active: boolean }.
• New methods: enterInputMode(scope?: 'all'|'hour'|'minute', options?: { focus?: boolean }) and exitInputMode().
• Restrict to time, date-time, time-date, and only when numeric columns exist; robust detection (class or [numeric-input]).
• Re-emit only when applicable; attach/detach listener to avoid duplicates.
• Fallback event emission in tests when picker methods aren’t available; deduped via internal state.
• Dev-only warnings via Build.isDev.

Does this introduce a breaking change?

• Yes
• No