Custom hour of day label formatter

[kennethj]

These changes add the features to custom the hour column. Currently, we can only set the TextStyle with the hour format of HH:mm and column width set at 48.0. This update adds the ability to set custom time formatting and column width.

• Adds theme property for formatting the hour of the day label.
• Adds theme property to set the width of hour column

Example

final theme = TimetableThemeData(
  formatHour: (time) => '${time.hourOf12HourClock} ${time.hourOfDay > 11 ? "PM" : "AM"}',
  hourColumnWidth: 40,
);

Checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Screenshots

Format hour

Android	iOS

Set column width

Larger	Zero width

[TheMkrage]

Is there any plan for this still? This is something we would love to make use of! Thank you

[IoanaAlexandru]

@TheMkrage while waiting for a PR to get approved, you can always just specify it in your dependencies:

timetable:
    git: https://github.com/iu-uits-es/timetable.git

[TatsuUkraine]

@JonasWanke any timeline when this feature will be merged?

[TatsuUkraine]

nvm) this solution still doesn't fit for me))) I need more customizable time labels)))

[Ahmadre]

@kennethj could you please check the conflicts? And @JonasWanke Any feedback to this?

[JonasWanke]

Thanks for your efforts! Due to the major refactor tracked in #17, I, unfortunately, can't directly use this PR, but am incorporating customizable time labels supporting custom widgets (addressing #41, #58, and #61).