gdal: add support for WEBP & ZSTD compressed GeoTIFFs

[rcoup]

Description

Support WEBP & ZSTD compression in GDAL/libtiff so you can import existing raster datasets using those compression methods. This doesn't implement any user-level changes wrt COG creation/etc.

• enable webp support in libtiff/gdal to support WebP COGs
• enable zstd support in libtiff/gdal to support ZSTD COGs
• enable lzma support in gdal (was already enabled for libtiff)

Checklist:

• [x] Have you reviewed your own change?
• Have you included test(s)?
• [x] Have you updated the changelog?