Pushdown Tigris queries with dot notation

[noisersup]

Description

Closes #1841.

Readiness checklist

• I added/updated unit tests.
• I added/updated integration/compatibility tests.
• 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), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

Merging #1908 (1b965e1) into main (31858ee) will increase coverage by 7.86%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1908      +/-   ##
==========================================
+ Coverage   62.06%   69.93%   +7.86%     
==========================================
  Files         316      316              
  Lines       15593    15604      +11     
==========================================
+ Hits         9678    10912    +1234     
+ Misses       5091     3739    -1352     
- Partials      824      953     +129     

Impacted Files	Coverage Δ
internal/handlers/pg/pgdb/query.go	73.39% <100.00%> (-0.13%)	⬇️
internal/handlers/tigris/tigrisdb/query.go	83.33% <100.00%> (+33.33%)	⬆️
internal/util/ctxutil/ctxutil.go	80.95% <0.00%> (-9.53%)	⬇️
internal/handlers/common/filter.go	84.65% <0.00%> (ø)
internal/handlers/common/params.go	96.32% <0.00%> (+1.33%)	⬆️
internal/handlers/tigris/tjson/schema.go	81.52% <0.00%> (+1.63%)	⬆️
internal/handlers/tigris/tjson/tjson.go	78.33% <0.00%> (+2.77%)	⬆️
internal/handlers/tigris/tjson/document.go	46.98% <0.00%> (+3.61%)	⬆️
integration/setup/setup.go	80.98% <0.00%> (+4.22%)	⬆️
integration/shareddata/shareddata.go	88.65% <0.00%> (+6.18%)	⬆️
... and 42 more

Flag	Coverage Δ
integration	66.11% <100.00%> (+11.36%)	⬆️
mongodb	14.24% <0.00%> (-0.03%)	⬇️
pg	54.58% <25.00%> (-0.06%)	⬇️
tigris	44.94% <75.00%> (?)
unit	29.09% <100.00%> (+0.30%)	⬆️

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

[chilagrow]

Great work!

[chilagrow]

Conflict to resolve @noisersup 💪

[w84thesun]

👍