feat: Add sphere.js getDistance

src/Sphere.fs

@@ -6,3 +6,14 @@ module Sphere =
 
     [<Import("getLength", "ol/sphere")>]
     let getLength geometry = jsNative
+
+    /// <summary>
+    /// Get the great circle distance (in meters) between two geographic coordinates.
+    /// @param {Array} c1 Starting coordinate.
+    /// @param {Array} c2 Ending coordinate.
+    /// @param {number} [radius] The sphere radius to use.  Defaults to the Earth's mean radius using the WGS84 ellipsoid.
+    /// @return {number} The great circle distance between the points (in meters).
+    /// @api
+    /// </summary>
+    [<Import("getDistance", "ol/sphere")>]
+    let getDistance (c1: Coordinate) (c2: Coordinate) (radius: float option) : float = jsNative