feat: Convert Carbon Object To Pointer

[ahmed3mar]

As per this issue #249 makes bundle size large because each call creates a new Carbon object

This pull request includes changes to the Carbon package to modify methods and tests to use pointer receivers instead of value receivers. This change ensures that any modifications within these methods directly affect the original Carbon instance, improving performance and consistency.

Changes to method signatures:

• Updated boundary.go to change method receivers from value to pointer for methods like StartOfCentury, EndOfCentury, StartOfDecade, EndOfDecade, StartOfYear, EndOfYear, StartOfQuarter, EndOfQuarter, StartOfMonth, EndOfMonth, StartOfWeek, EndOfWeek, StartOfDay, EndOfDay, StartOfHour, EndOfHour, StartOfMinute, EndOfMinute, StartOfSecond, and EndOfSecond. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]

Changes to unit tests:

• Updated boundary_unit_test.go to change the carbon field in test structs from value to pointer for test functions like TestCarbon_StartOfCentury, TestCarbon_EndOfCentury, TestCarbon_StartOfDecade, TestCarbon_EndOfDecade, TestCarbon_StartOfYear, TestCarbon_EndOfYear, TestCarbon_StartOfQuarter, TestCarbon_EndOfQuarter, TestCarbon_StartOfMonth, TestCarbon_EndOfMonth, TestCarbon_StartOfWeek, TestCarbon_EndOfWeek, TestCarbon_StartOfDay, TestCarbon_EndOfDay, TestCarbon_StartOfHour, TestCarbon_EndOfHour, TestCarbon_StartOfMinute, TestCarbon_EndOfMinute, TestCarbon_StartOfSecond, and TestCarbon_EndOfSecond. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]

Changes to calendar.go:

• Updated methods in calendar.go to use pointer receivers for Lunar, Julian, and Persian conversions, and changed the return type of CreateFromLunar and CreateFromJulian to pointers. [1] [2]

[kuafuRace]

Destructive changes can only be made in version v3

[ahmed3mar]

@gouguoyin no problem feel free to update or create new version with it