feat: Add support for cid-only time travel queries

[AndrewSisley]

Relevant issue(s)

Resolves #3214

Description

Adds support for cid-only time travel queries.

Collection-level commit don't work yet, but I'm going to sort that out in another branch.

Also removes some dead code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.50%. Comparing base (27893cf) to head (db13086).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3256      +/-   ##
===========================================
- Coverage    77.56%   77.50%   -0.06%     
===========================================
  Files          382      382              
  Lines        35301    35294       -7     
===========================================
- Hits         27379    27354      -25     
- Misses        6291     6307      +16     
- Partials      1631     1633       +2     

Flag	Coverage Δ
all-tests	77.50% <100.00%> (-0.06%)	⬇️

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Files with missing lines	Coverage Δ
internal/db/fetcher/versioned.go	75.69% <100.00%> (-0.23%)	⬇️
internal/planner/select.go	84.85% <100.00%> (+0.14%)	⬆️

... and 8 files with indirect coverage changes

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[fredcarle]

LGTM!

I was going to ask to remove the dskey and docID references on the versioned fetcher but I noticed you took care of it in your other PR 👍