ADIOS2: Require v2.9 as minimum

[franzpoeschel]

Version 2.9 has modifiable attributes which are necessary for properly implementing variable-based encoding.

TODO

• Require ADIOS2 v2.9 in CMake
• Remove version guards for v2.8 and v2.9 from the C++ codebase
• Update CI
• Documentation
• Python packaging
• The clang-7/8 installations of ADIOS2 v2.9 fail building Blosc2 as a dependecy due to some missing intrinsic? Also one of them fails building mgard. Maybe report.

[franzpoeschel]

For some reason, ADIOS2 has trouble linking against C-Blosc2 with clang6 and clang7. clang14 works, bisecting this would be too much trouble.

     984     /home/franzpoeschel/workspace/singularity_openpmd/spack/lib/spack/env/clang/clang++ -O3 -DNDEBUG CMakeFiles/adios2_remote_server.dir/remote_server.cpp.o CMakeFiles/adios2_remote_s 
             erver.dir/remote_common.cpp.o -o ../../../../bin/adios2_remote_server  -Wl,-rpath,/tmp/franzpoeschel/spack-stage/spack-stage-adios2-2.10.0-bjro7kiefbluehobn35oxvnrooqsgqak/spack-b 
             uild-bjro7ki/lib:/home/franzpoeschel/workspace/singularity_openpmd/spack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/c-blosc2-2.11.1-qgxv3lsjj77sukwj2i3za35gpj66pxzu/lib:/home/ 
             franzpoeschel/workspace/singularity_openpmd/spack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/zstd-1.5.6-2wui5irvaceh3ybks5p6es24tbr7ioq7/lib:/home/franzpoeschel/workspace/sing 
             ularity_openpmd/spack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/lz4-1.9.4-imjreiyroqm4itvhjdnrc7xllbylqhrr/lib:/home/franzpoeschel/workspace/singularity_openpmd/spack/opt/spa 
             ck/linux-ubuntu20.04-x86_64/clang-7.0.0/zlib-ng-2.1.6-m5ec7k47kaawspqhc4vv6xcysggg3yub/lib::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
             ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
             ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
             ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
             ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
             ::::::::::::::::::::: ../../../../lib/libadios2_evpath.so.2.10.0 ../../../../lib/libadios2_core.so.2.10.0 ../../../../lib/libadios2_ffs.so.2.10.0 ../../../../lib/libadios2_atl.so. 
             2.10.0 -pthread -ldl -Wl,-rpath-link,/tmp/franzpoeschel/spack-stage/spack-stage-adios2-2.10.0-bjro7kiefbluehobn35oxvnrooqsgqak/spack-build-bjro7ki/lib:/home/franzpoeschel/workspac 
             e/singularity_openpmd/spack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/c-blosc2-2.11.1-qgxv3lsjj77sukwj2i3za35gpj66pxzu/lib:/home/franzpoeschel/workspace/singularity_openpmd/s 
             pack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/zstd-1.5.6-2wui5irvaceh3ybks5p6es24tbr7ioq7/lib:/home/franzpoeschel/workspace/singularity_openpmd/spack/opt/spack/linux-ubuntu2 
             0.04-x86_64/clang-7.0.0/lz4-1.9.4-imjreiyroqm4itvhjdnrc7xllbylqhrr/lib:/home/franzpoeschel/workspace/singularity_openpmd/spack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/zlib- 
             ng-2.1.6-m5ec7k47kaawspqhc4vv6xcysggg3yub/lib                                                                                                                                       
  >> 985     /usr/bin/ld: /home/franzpoeschel/workspace/singularity_openpmd/spack/opt/spack/linux-ubuntu20.04-x86_64/clang-7.0.0/c-blosc2-2.11.1-qgxv3lsjj77sukwj2i3za35gpj66pxzu/lib/libblosc2. 
             so.2: undefined reference to `_xgetbv'