Add AstronomicalConstant to TinyMoon + Move files around

[mannylopez]

Closes #10

Does the heavy lifting of incorporating #18 AstronomicalConstant work and using those calculations to power TinyMoon under the hood.

Also added ExactMoon since I now have a concept of a more "traditional' moon API that returns a full day's worth of phase, instead of very exact phases.

/// The `ExactMoon` object for a specific date and time.
///
/// This object represents the precise moon phase for a given date and time, without prioritizing major moon phases 
// (new moon, first quarter, full moon, last quarter)  over others. It provides a more detailed and accurate representation 
// of the moon's phase, suitable for applications requiring precise lunar data.
///
/// Use `exactMoonPhase` when the specificity of the lunar phase is critical to your application, such as in astronomical apps 
// or detailed lunar tracking that rely on precise moon phase calculations.
///
/// - Note: Unlike `moonPhase`, which may prioritize major moon phases occurring at any point within a 24-hour period, 
// `exactMoonPhase` focuses on the exact lunar phase at the given moment.
///
/// For example, given that the full moon occurs on `August 19, 2024 at 13:25 UTC` and the date we query for is `August 19, 
// 2024 at 00:00 UTC`, this object will return `.waxingGibbous` because that is a more accurate representation of the moon 
// phase at `00:00 UTC` time.

/// The `Moon` object for a specific date, prioritizing major phases.
///
/// Use this object when you need a general understanding of the moon's phase for a day, especially when emphasizing the 
// major phases is important for your application's context.
///
/// If one of the major moon phases (new moon, first quarter, full moon, last quarter) occurs at any time within the 24-hour 
// period of the specified date, this object will reflect that major moon phase.
///
/// If no major moon phase occurs within the date's 24 hours (starting at 00:00 and ending at 23:59), the object will 
// represent the moon phase closest to the specified date and time.
///
/// - Note: Unlike `ExactMoon`, this object will prioritize major moon phases occurring at any point within a 24-hour period.

Previous API properties (name, moonPhase, isFullMoon, emoji, date) stays the same