Add helpers for accessing objects by paths.

[AlekSi]

No description provided.

[codecov-commenter]

Codecov Report

Merging #140 (60f9c93) into main (fd512ce) will increase coverage by 1.24%.
The diff coverage is 80.53%.

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   43.04%   44.28%   +1.24%     
==========================================
  Files          83       87       +4     
  Lines        4210     4349     +139     
==========================================
+ Hits         1812     1926     +114     
- Misses       2044     2064      +20     
- Partials      354      359       +5     

Impacted Files	Coverage Δ
internal/handlers/shared/msg_getparameter.go	75.00% <ø> (ø)
internal/types/array.go	50.00% <50.00%> (ø)
internal/types/document.go	57.36% <53.57%> (-1.20%)	⬇️
internal/util/testutil/path.go	88.88% <88.88%> (ø)
internal/types/types.go	93.33% <93.33%> (ø)
internal/types/path.go	100.00% <100.00%> (ø)

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