[DOP-22585] change column type from str to jsonb

[TiGrib]

Change Summary

change value column type from str to jsonb

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.63%. Comparing base (14a4931) to head (095c5d5).
Report is 151 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #145   +/-   ##
========================================
  Coverage    92.63%   92.63%           
========================================
  Files          176      176           
  Lines         3858     3858           
  Branches       265      265           
========================================
  Hits          3574     3574           
  Misses         222      222           
  Partials        62       62           

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