EXP: try getting standalone manifests working in Rust core

[ctb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 10.52632% with 17 lines in your changes missing coverage. Please review.

Project coverage is 86.59%. Comparing base (1f05359) to head (affae94).
Report is 6 commits behind head on latest.

Files	Patch %	Lines
src/core/src/collection.rs	5.55%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #3303      +/-   ##
==========================================
- Coverage   86.68%   86.59%   -0.10%     
==========================================
  Files         137      137              
  Lines       16003    16021      +18     
  Branches     2728     2728              
==========================================
+ Hits        13872    13873       +1     
- Misses       1822     1839      +17     
  Partials      309      309              

Flag	Coverage Δ
hypothesis-py	25.40% <ø> (ø)
python	92.37% <ø> (ø)
rust	62.59% <10.52%> (-0.34%)	⬇️

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[ctb]

experiment concluded! see sourmash-bio/sourmash_plugin_branchwater#430 et al.