make `coalesce` compile friendly

[ValterH]

Update coalesce to be torch compiled without graph breaks.

[ValterH]

@akihironitta I added a test case, but had to remove the error message as torch._check requires the message to be callable and passing a lambda function causes a graph break during compilation.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 85.08%. Comparing base (c211214) to head (1bfbbf2). :warning: Report is 137 commits behind head on master.

Files with missing lines	Patch %	Lines
torch_geometric/utils/_coalesce.py	66.66%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10522      +/-   ##
==========================================
- Coverage   86.11%   85.08%   -1.03%     
==========================================
  Files         496      510      +14     
  Lines       33655    35967    +2312     
==========================================
+ Hits        28981    30603    +1622     
- Misses       4674     5364     +690     

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