Add h5 streamed writes

[mattcieslak]

Adds docs and code for flushing results as they're computed

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.34686% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.93%. Comparing base (1de8eed) to head (6155b08).

Files with missing lines	Patch %	Lines
R/analyse.R	84.97%	32 Missing ⚠️
R/analyse-helpers.R	91.37%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
- Coverage   89.51%   88.93%   -0.59%     
==========================================
  Files           6        6              
  Lines        1717     1961     +244     
==========================================
+ Hits         1537     1744     +207     
- Misses        180      217      +37     

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