fix(storage): mapstructure and json tag colocation

[42atomys]

Describe the pull request

mapstructure dont anymore allow us to use json tag field. a tag field colocation is know needed

Checklist

• I have linked the relative issue to this pull request
• I have made the modifications or added tests related to my PR
• I have added/updated the documentation for my RP
• I put my PR in Ready for Review only when all the checklist is checked

Breaking changes ?
no

Additional context

[codecov-commenter]

Codecov Report

Merging #85 (b82b182) into main (9b6a9d1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #85   +/-   ##
=======================================
  Coverage   94.00%   94.00%           
=======================================
  Files          22       22           
  Lines         968      968           
=======================================
  Hits          910      910           
  Misses         39       39           
  Partials       19       19           

Impacted Files	Coverage Δ
pkg/storage/postgres/postgres.go	86.36% <ø> (ø)
pkg/storage/rabbitmq/rabbitmq.go	83.01% <ø> (ø)
pkg/storage/redis/redis.go	100.00% <ø> (ø)

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