feat(sedona-functions): Implement native ST_NumGeometries using WKBHeader

[petern48]

Part of #198

[petern48]

[petern48]

Look! This came in handy 🤠 (I didn't have a great idea of what you wanted first_xy for, but this was neat)

[petern48]

I was also thinking about pulling out this logic into a new is_empty function, since there are other places we'd want this (e.g ST_IsEmpty). I was thinking about something like one of these in sedona-geometry

A new method in WkbHeader:

// WkbHeader
    pub fn is_empty(&self) -> Result<bool>, SedonaGeometryError> {

OR a new function in sedona_geometry::is_empty.rs that takes a WkbHeader

// proposed function
pub fn is_geometry_empty_header(
    header: WkbHeader,
) -> Result<bool, SedonaGeometryError> {

// The Existing function
pub fn is_geometry_empty<G: GeometryTrait<T = f64>>(
    geometry: &G,
) -> Result<bool, SedonaGeometryError> {

The former is cleaner imo, but I wasn't sure if you'd agree that it makes sense for WkbHeader to have that method.

[paleolimbot]

I think it makes sense for the WkbHeader to have an is_empty() method!

[paleolimbot]

Thank you!

Will be slightly cleaner with the is_empty() bit you suggested (feel free to do that here or some other time!)