add jsonb to fields mapping

[manuelmeurer]

Description

JSONB fields should be displayed as code, just like JSON fields.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Manual review steps

Use discover_columns with a model that has a JSONB column. Without this PR, the column is not displayed, with this PR it is.

Happy to add tests if necessary.
Also, defining the FIELDS_MAPPING const could be cleaned up a bit, since many fields have the same value, e.g.:

FIELDS_MAPPING = {
  belongs_to: %i[references belongs_to],
  boolean:    %i[boolean],
  code:       %i[json jsonb],
  date_time:  %i[datetime timestamp time],
  date:       %i[date],
  id:         %i[primary_key],
  number:     %i[integer float decimal binary],
  text:       %i[string],
  textarea:   %i[text]
}.each_with_object({}) do |(key, value), hash|
  value.each {
    hash[_1] = {
      field: key.to_s
    }
  }
end.freeze

[qlty-cloud-legacy]

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[Paul-Bob]

Thank you for this contribution @manuelmeurer!