[WIP] begin adding the machinery for CSV column renaming

[ctb]

Tackling #1555

TODO:

• provide column documentation for v5

[codecov]

Codecov Report

Merging #2274 (5bbe178) into latest (a8bd648) will increase coverage by 7.32%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           latest    #2274      +/-   ##
==========================================
+ Coverage   84.82%   92.15%   +7.32%     
==========================================
  Files         131      100      -31     
  Lines       15676    11406    -4270     
  Branches     2251     2252       +1     
==========================================
- Hits        13297    10511    -2786     
+ Misses       2085      601    -1484     
  Partials      294      294              

Flag	Coverage Δ
python	92.15% <100.00%> (+<0.01%)	⬆️
rust	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/sourmash/commands.py	90.12% <ø> (ø)
src/sourmash/cli/gather.py	100.00% <100.00%> (ø)
src/sourmash/search.py	97.97% <100.00%> (+0.02%)	⬆️
src/core/src/ffi/minhash.rs
src/core/src/index/revindex.rs
src/core/src/ffi/mod.rs
src/core/src/ffi/nodegraph.rs
src/core/src/index/linear.rs
src/core/src/ffi/utils.rs
src/core/src/index/search.rs
... and 24 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more