Add Date/Time Picker Components (DatePicker, TimePicker, DateRangePicker)

[ManojVysyaraju]

Is your feature request related to a problem? Please describe.
QUI currently lacks date/time input components, which are essential for forms requiring date
selection (bookings, scheduling, filtering, etc.). Users must either use native HTML5 inputs
(inconsistent across browsers) or integrate third-party libraries that don't match QUI's design
system.

Describe the solution you'd like
Implement a suite of date/time picker components following QUI's established 3-tier architecture:

1. DatePicker (Priority: High) - Single date selection with calendar popup
2. DateRangePicker (Priority: Medium) - Start/end date range selection
3. TimePicker (Priority: Medium) - Hour/minute/second selection
4. DateTimePicker (Priority: Low) - Combined date + time selection

Components should include:

• Calendar navigation (month/year)
• Keyboard accessibility (arrow keys, Enter, Escape)
• Min/max date constraints
• Disabled date ranges
• Multiple size variants (sm, md, lg)
• Theme support (all QDS themes)
• Localization support
• Integration with React Hook Form / Angular Forms

Describe alternatives you've considered

• Native HTML5 <input type="date"> - Inconsistent UI across browsers, limited styling
• Third-party libraries (react-datepicker, antd DatePicker) - Don't match QDS design system
• Building custom solutions - No consistency, duplicated effort

Additional context
Infrastructure: dayjs, @floating-ui/react, accessibility patterns already available
Expected scope: ~50-60 files for MVP (React DatePicker only)
Full implementation: ~100-130 files (similar to Stepper #221)