feat(context): methods to get nested map from query string

[dorzepowski]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (3dc1cd6) to head (256e3f8).
Report is 67 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4029      +/-   ##
==========================================
- Coverage   99.21%   99.06%   -0.16%     
==========================================
  Files          42       44       +2     
  Lines        3182     2778     -404     
==========================================
- Hits         3157     2752     -405     
+ Misses         17       15       -2     
- Partials        8       11       +3     

Flag	Coverage Δ
	?
-tags "sonic avx"	99.05% <100.00%> (?)
-tags nomsgpack	99.04% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	99.06% <100.00%> (-0.16%)	⬇️
macos-latest	99.05% <100.00%> (-0.16%)	⬇️
ubuntu-latest	99.04% <100.00%> (-0.17%)	⬇️

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[dorzepowski]

1. Recently I fixed the issue that makes one test sometimes failing
2. Also I added support for arrays at the value level of the nested map, while implicit arrays are still returning only first value

In other words:

GET /get?filter[names][]=alice&filter[names][]=bob

will produce map

map[names:[alice bob]]

while:

GET /get?filter[status]=new&filter[status]=old HTTP/1.1

will produce the map with only single value at given key

map[status:new]

This may (or may not) be a good alternative for the #2139 approach