feat: add millisecond support to date-time picker

[WilliamCepeda]

• extend DateTimeAdapter API with getMilliseconds, setMilliseconds and createDate(milliseconds)
• implement milliseconds in NativeDateTimeAdapter and UnixTimestampDateTimeAdapter
• update createDate and createDateWithOverflow utilities to accept/validate milliseconds
• add showMillisecondsTimer and stepMillisecond inputs; wire millisecond handling in timer and container
• update timer templates/components (timer box maxlength/padding, millisecond controls, enable/disable logic)
• add intl labels for millisecond controls
• adjust native/unix formats to include seconds where needed
• increase timer input width and add milliseconds demo in the app

[Warrio111]

@danielmoncada please Accept this Pr is really important to have miliseconds in industry systems

[danielmoncada]

@WilliamCepeda thanks for the PR. Mind resolving conflicts?

[WilliamCepeda]

@danielmoncada conflicts resolved

[danielmoncada]

@WilliamCepeda thanks! let me test locally really quick before a publish

[danielmoncada]

@WilliamCepeda the addition of ms is causing the unit tests to fail, fyi

[WilliamCepeda]

@danielmoncada just committed a fix and ran tests locally