Access global dataset attributes via dataset.{attr_name}

[rusty1s]

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[codecov]

Codecov Report

Merging #6319 (e9dc797) into master (60a2f81) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head e9dc797 differs from pull request most recent head a8ff340. Consider uploading reports for the commit a8ff340 to get more accurate results

@@           Coverage Diff           @@
##           master    #6319   +/-   ##
=======================================
  Coverage   84.44%   84.45%           
=======================================
  Files         385      385           
  Lines       21374    21381    +7     
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+ Hits        18050    18057    +7     
  Misses       3324     3324           

Impacted Files	Coverage Δ
torch_geometric/data/in_memory_dataset.py	86.84% <100.00%> (+1.33%)	⬆️

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