Add RecordID to types.Document

[AlekSi]

Description

Refs #3458.

Readiness checklist

• I added/updated unit tests (and they pass).
• I added/updated integration/compatibility tests (and they pass).
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Milestone (Next), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

Merging #3495 (df6c1f2) into main (f9f5e9a) will decrease coverage by 1.36%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##             main    #3495      +/-   ##
==========================================
- Coverage   74.49%   73.13%   -1.36%     
==========================================
  Files         424      424              
  Lines       26539    26548       +9     
==========================================
- Hits        19770    19416     -354     
- Misses       5632     5951     +319     
- Partials     1137     1181      +44     

Files	Coverage Δ
internal/handlers/sjson/sjson.go	85.65% <ø> (ø)
internal/types/object_id.go	91.30% <100.00%> (ø)
internal/types/timestamp.go	100.00% <100.00%> (ø)
internal/types/types.go	94.11% <100.00%> (+0.08%)	⬆️
internal/types/document.go	90.29% <0.00%> (-1.56%)	⬇️

... and 33 files with indirect coverage changes

Flag	Coverage Δ
filter-false	?
filter-true	67.79% <27.27%> (-1.57%)	⬇️
hana-1	?
integration	67.79% <27.27%> (-1.61%)	⬇️
mongodb-1	4.60% <0.00%> (-0.01%)	⬇️
pg-1	?
pg-2	42.90% <27.27%> (-0.56%)	⬇️
pg-3	42.64% <18.18%> (-0.64%)	⬇️
postgresql-1	∅ <ø> (∅)
postgresql-2	?
postgresql-3	?
sort-false	67.79% <27.27%> (-1.18%)	⬇️
sort-true	?
sqlite-1	39.47% <27.27%> (-0.09%)	⬇️
sqlite-2	42.21% <27.27%> (-0.03%)	⬇️
sqlite-3	42.14% <18.18%> (-0.09%)	⬇️
unit	25.18% <63.63%> (-0.08%)	⬇️

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

[rumyantseva]

LGTM!