Fix camelCase naming and convert pixel coordinates from Double to Float

[afarber]

• Fix tileoverlay -> tileOverlay in TileOverlay.kt ID string
• Change ProjectionUtils.latLngToPixel() to return Pair<Float, Float> instead of Pair<Double, Double>
• Update 11 drawing methods in MapController to use Float parameters for pixel coordinates
• Simplify Projection.kt by removing unnecessary Double conversion
• Update test assertions to handle the Float return type