[MD]: removing ImageIOReader usage on CatalogBuilder in favor of CoverageReader which now implements GridCoverage2DReader
[MD] - Starting refactoring CatalogBuilder (=> ImageMosaicWalker, CatalogManager, MosaicBeanBuilder)
- Supporting multipleCoverages on ImageMosaic
- Updating RasterManager coverages info initialization
- Implementing missing GridCoverage2DReader methods on NetCDFReader