feat: Enable indexing for DateTime fields

[islamaliev]

Relevant issue(s)

Resolves #2914

Description

Make indexes handle time.Time type as well.
For this encoding/decoding of time type is added to encoding package.

[codecov]

Codecov Report

Attention: Patch coverage is 14.66667% with 64 lines in your changes missing coverage. Please review.

Project coverage is 79.33%. Comparing base (9422244) to head (311840f).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
internal/db/fetcher/indexer_iterators.go	8.00%	23 Missing ⚠️
internal/encoding/time.go	23.33%	23 Missing ⚠️
internal/encoding/field_value.go	11.11%	15 Missing and 1 partial ⚠️
internal/encoding/type.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2933      +/-   ##
===========================================
- Coverage    79.50%   79.33%   -0.17%     
===========================================
  Files          325      326       +1     
  Lines        24781    24856      +75     
===========================================
+ Hits         19701    19718      +17     
- Misses        3670     3726      +56     
- Partials      1410     1412       +2     

Flag	Coverage Δ
all-tests	79.33% <14.67%> (-0.17%)	⬇️

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

Files	Coverage Δ
internal/encoding/encoding.go	100.00% <ø> (ø)
internal/encoding/type.go	88.24% <0.00%> (-11.76%)	⬇️
internal/encoding/field_value.go	64.36% <11.11%> (-11.55%)	⬇️
internal/db/fetcher/indexer_iterators.go	76.30% <8.00%> (-4.49%)	⬇️
internal/encoding/time.go	23.33% <23.33%> (ø)

... and 18 files with indirect coverage changes

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[AndrewSisley]

LGTM thanks Islam :)

thought: I think (not in this PR) that the GQL code should change so that all field types are not supported by default, or we'll likely have this same issue in the future.

[fredcarle]

Damn... I'm so much younger than I thought. I love this!

[fredcarle]

LGTM. Thanks for the fix.