Add single node CRG template

[BrianMichell]

Implements the CRG template. Currently uses a placeholder name until a better one can be settled on.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.06%. Comparing base (c3ba558) to head (92ac8c4).
⚠️ Report is 250 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #861      +/-   ##
==========================================
+ Coverage   85.30%   93.06%   +7.75%     
==========================================
  Files          46      147     +101     
  Lines        2219     8406    +6187     
  Branches      306      469     +163     
==========================================
+ Hits         1893     7823    +5930     
- Misses        281      509     +228     
- Partials       45       74      +29     

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[andgineer]

Default chunk is (1, 512, 4096) — that splits our ~30k-sample CRG traces on time.

We're on (1, 512, 32768) so a whole trace stays one chunk. Can you flip the template default to that?