chore: simplify http query array parsing

[kevwan]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.57%. Comparing base (8690859) to head (0ee9eb3).
Report is 260 commits behind head on master.

Additional details and impacted files

Files with missing lines	Coverage Δ
core/mapping/fieldoptions.go	100.00% <ø> (ø)
core/mapping/unmarshaler.go	96.18% <100.00%> (-0.31%)	⬇️
core/mapping/utils.go	100.00% <ø> (ø)

... and 7 files with indirect coverage changes

[xuerbujia]

If simply remove the comma array, then some users who are using this feature in version 1.7.5-1.8.0 and who do not have the condition mentioned in #4629 will not be able to upgrade to a later version