Compatibility with PyGv2.2

What's Changed

• Upgrade to PyG v2.0.4 by @rampasek in #4
• Refactored model ckpting and loading by @rampasek in #9
• Added LRGB datasets by @rampasek in #10
• PCQM4Mv2 cfg to run pretrained GPS model by @rampasek in #11
• SBM (PATTERN and CLUSTER) accuracy fix by @rampasek in #12
• PCQM4Mv2 test-dev by @rampasek in #17
• PyG v2.2 update by @rampasek in #22

Full Changelog: v1.0.0...v1.2.0

Initial release

Initial release (using PyG v2.0.2) used to produce original results in https://arxiv.org/abs/2205.12454v1