Move tjson into internal/handlers/tigris/tjson

[chilagrow]

Description

Closes #1252.

We don't know how to deal with CVE-2022-3517 security issue, so we are skipping it in build/.trivyignore.

Readiness checklist

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the 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.

[vercel]

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Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Oct 21, 2022 at 7:48AM (UTC)

[codecov]

Codecov Report

Merging #1291 (d0e1a76) into main (7ca4464) will decrease coverage by 0.07%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1291      +/-   ##
==========================================
- Coverage   67.33%   67.26%   -0.08%     
==========================================
  Files         275      275              
  Lines       12857    12857              
==========================================
- Hits         8657     8648       -9     
- Misses       3293     3302       +9     
  Partials      907      907              

Impacted Files	Coverage Δ
internal/handlers/tigris/json_schema.go	84.21% <ø> (ø)
internal/handlers/tigris/msg_delete.go	68.35% <ø> (ø)
internal/handlers/tigris/tigrisdb/insert.go	42.85% <ø> (ø)
internal/handlers/tigris/tigrisdb/query.go	78.94% <ø> (ø)
internal/handlers/tigris/tigrisdb/update.go	45.45% <ø> (ø)
internal/handlers/tigris/tjson/binary.go	67.85% <ø> (ø)
internal/handlers/tigris/tjson/bool.go	59.09% <ø> (ø)
internal/handlers/tigris/tjson/datetime.go	56.00% <ø> (ø)
internal/handlers/tigris/tjson/document.go	44.70% <ø> (ø)
internal/handlers/tigris/tjson/double.go	59.09% <ø> (ø)
... and 12 more

Flag	Coverage Δ
integration	62.81% <ø> (-0.08%)	⬇️
mongodb	14.16% <ø> (-0.03%)	⬇️
pg	52.32% <ø> (-0.08%)	⬇️
tigris	34.68% <ø> (-0.03%)	⬇️
unit	25.63% <ø> (-0.03%)	⬇️

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

[w84thesun]

LGTM