Blosc2: Config.cmake Package in 2.10.2+

[ax3l]

Hi,

As you know as one of our activities, we build an all-static version of ADIOS2 for Python wheels in openPMD-api.

Struggling with some of the dependencies in C-Blosc2, I decided to contribute a blosc2Config.cmake package in:
Blosc/c-blosc2#537

@vicentebolea you might be able to bump the ADIOS2 C-Blosc2 dependency once this is merged and can remove the FindBLOSC2.cmake file, which had trouble picking up transitive dependencies in static builds.

[ax3l]

Update: merged to C-Blosc2.
This should become part of a release after C-Blosc2 v2.10.0.

[ax3l]

@vicentebolea FYI, I forget a few details for external, transitive dependencies. Fixes coming to 2.10.2+:
Blosc/c-blosc2#541
Blosc/c-blosc2#542
Blosc/c-blosc2#540 (MinGW)