Make data type dynamic

[hanbyul-here]

The data type is currently hard-coded as float32 : https://github.com/developmentseed/numeric-data-layer/blob/main/src/layers/NumericDataLayer/index.tsx#L16 , shader is written assuming that the data type is float 32. https://github.com/developmentseed/numeric-data-layer/blob/main/src/layers/NumericDataPaintLayer/index.tsx#L61