feat: Sec. index on json

[islamaliev]

Relevant issue(s)

Resolves #2280

Description

Enables json fields indexing.

JSON interface has been extended to allow traversing it with different configurations.

Indexing or documents has been refactor so that instead of acting based off of the fact that there is a special field in the index description (like array or json), we assign a field-specific generator so that every field is responsible for generating a value for the inde key. For example, if we have a composite index made up of fields of types int, array and json (complex composite index), we will generate all possible combinations where int generator will always generate 1 value, array generator will generate values for every element and json generator will generate values for every json node.

Added json encoding/decoding to our encoding package.

[codecov]

Codecov Report

Attention: Patch coverage is 86.57635% with 109 lines in your changes missing coverage. Please review.

Project coverage is 78.46%. Comparing base (cdba31b) to head (f237f2f).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
internal/db/fetcher/indexer_matchers.go	75.00%	52 Missing and 13 partials ⚠️
internal/db/index.go	81.05%	12 Missing and 6 partials ⚠️
client/json.go	96.15%	6 Missing and 2 partials ⚠️
internal/encoding/json.go	92.52%	5 Missing and 3 partials ⚠️
internal/encoding/errors.go	62.50%	2 Missing and 1 partial ⚠️
internal/encoding/field_value.go	90.91%	2 Missing and 1 partial ⚠️
internal/db/fetcher/errors.go	0.00%	2 Missing ⚠️
internal/db/fetcher/indexer.go	0.00%	1 Missing ⚠️
internal/db/fetcher/indexer_iterators.go	98.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3330      +/-   ##
===========================================
+ Coverage    78.00%   78.46%   +0.46%     
===========================================
  Files          389      392       +3     
  Lines        35446    35640     +194     
===========================================
+ Hits         27648    27964     +316     
+ Misses        6151     6044     -107     
+ Partials      1647     1632      -15     

Flag	Coverage Δ
all-tests	78.46% <86.58%> (+0.46%)	⬆️

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

Files with missing lines	Coverage Δ
client/normal_util.go	96.12% <100.00%> (+0.12%)	⬆️
internal/encoding/bool.go	100.00% <100.00%> (ø)
internal/encoding/encoding.go	100.00% <ø> (ø)
internal/encoding/null.go	100.00% <100.00%> (ø)
internal/encoding/type.go	100.00% <100.00%> (+11.76%)	⬆️
internal/planner/scan.go	90.04% <100.00%> (+0.16%)	⬆️
internal/db/fetcher/indexer.go	83.69% <0.00%> (ø)
internal/db/fetcher/indexer_iterators.go	85.01% <98.44%> (+10.06%)	⬆️
internal/db/fetcher/errors.go	37.04% <0.00%> (+21.04%)	⬆️
internal/encoding/errors.go	82.76% <62.50%> (-7.72%)	⬇️
... and 5 more

... and 13 files with indirect coverage changes

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