Add support for Tigris auth parameters

[AlekSi]

Description

Those parameters are needed for the cloud version of Tigris.

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	Sep 26, 2022 at 6:28PM (UTC)

[codecov]

Codecov Report

Merging #1177 (cf0925a) into main (9798110) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1177   +/-   ##
=======================================
  Coverage   66.16%   66.16%           
=======================================
  Files         250      250           
  Lines       12249    12260   +11     
=======================================
+ Hits         8104     8112    +8     
- Misses       3252     3254    +2     
- Partials      893      894    +1     

Impacted Files	Coverage Δ
internal/handlers/registry/registry.go	36.66% <ø> (ø)
ferretdb/ferretdb.go	93.75% <100.00%> (+0.72%)	⬆️
internal/handlers/registry/tigris.go	100.00% <100.00%> (ø)
internal/handlers/tigris/tigris.go	76.19% <100.00%> (+3.96%)	⬆️
internal/util/version/version.go	55.00% <0.00%> (-5.00%)	⬇️
internal/handlers/common/filter.go	86.01% <0.00%> (ø)

Flag	Coverage Δ
integration	62.45% <100.00%> (+<0.01%)	⬆️
mongodb	14.80% <47.05%> (+<0.01%)	⬆️
pg	51.86% <47.05%> (-0.04%)	⬇️
tigris	34.44% <52.94%> (-0.01%)	⬇️
unit	23.99% <47.05%> (-0.01%)	⬇️

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

[rumyantseva]

The code looks ok, but maybe we can add more docs somewhere? (E.g. some links where to read about those params as Tigris is quite a specific thing)

[AlekSi]

@rumyantseva I added comments for our embedded usage, PTAL

[rumyantseva]

LGTM