Support for LERC codec

[avalentino]

Please consider to support Limited Error Raster Compression (LERC).
LERC is a very interesting lossy compressor that is currently very poplar in the GIS world but it is extremely interesting fot all scientific applications IMHO.

[FrancescAlted]

We are indeed very open to start implementing lossy codecs in Blosc2. Right now, and thanks to a NumFOCUS grant, there is an ongoing effort towards implementing support for zfp. However, after bad experiences with platform portability with snappy on C-Blosc1, we decided not include C++ code in C-Blosc2 anymore.

A possibility would be to include support for LERC and require an external library to link with. Although we prefer to vendor sources, we can do an exception if LERC is considered important for GIS (a field that we would like to support as better as we can). So PRs in that direction will be seriously considered.

[FrancescAlted]

After completing the dynaminc plugin support, producing a plugin for LERC and maintaining a separate repo for this seems like a reasonable thing to do. See the grok plugin for Blosc2 as an example: https://www.blosc.org/posts/blosc2-grok-release/