tensorflow-lite-gpu 2.5.0 missing bindings

[v-hogood]

Some bindings went missing going from tensorflow-lite-gpu 2.4.0 to 2.5.0:
GpuDelegate
CompatibilityList.BestOptionsForThisDevice
(and possibly others?)

[wollac11]

Seems 2.5.0 is the first version with them missing, but 2.5.0.1 and 2.5.0.2 (the latest at the time of writing) are also both missing them. There is another package 'Xamarin.TensorFlow.Lite.Gpu.Delegate.Plugin' (the latest version of which currently is v0.3.1) that I thought might contain those bindings but that one does not seem to expose any bindings at all.

[v-hogood]

Right the bindings are in tensorflow-lite-gpu not tensorflow-lite-gpu-delegate-plugin.

[v-hogood]

Maybe related to #876?

[FlatlinerDOA]

Same issue with 2.6.0.2, seems like this keeps regressing.