Use TileXYZ instead of QuadkeysAndAltitudekeys

[mi-24v]

Is your feature request related to a problem? Please describe.

There is overhead about converting QuadKey into 3D-tile key index.

Spatial ID uses f, x and y independently.
While both 3D-tile key index and QuadkeysAndAltitudekeys have z-order feature, QuadkeysAndAltitudekeys causes convert between QuadKey and 3D-tile key for using independent indices.
This conversion is not essential and has overhead.

Describe the solution you'd like

QuadkeysAndAltitudekeys needs to replace into TileXYZ

Describe alternatives you've considered

It is breaking change because backward compatibility will be broken if QuadkeysAndAltitudekeys are deleted totally.
It needs transition duration.

Additional context

(nothing)