tabular mapping: display join column details for user

[raprasad]

The WorldMap layer options need to have descriptive text for the user (see screenshot below). This info is already supplied via the API and stored in Geoconnect.

• [ ] UI/UX review of where/how to display this information
• [ ] Coding for dynamic display

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Some examples of expected_format info supplied by WorldMap. (There is more info available including the layer title, abstract, etc, etc.

• Boston ISD Neighborhood Name

  "expected_format": {
      "expected_zero_padded_length": -1, 
      "is_zero_padded": false, 
      "description": "Boston, Administrative Geography, ISD Neighborhood Name.  Examples: \"South Boston\", \"Mission Hill\", \"Charlestown\", \"Hyde Park\"", 
      "name": "Boston ISD Neighborhood Name"
    }, 

• 2010 Census Block Group (12-digit FIPS code)

  "expected_format": {
      "expected_zero_padded_length": 12, 
      "is_zero_padded": true, 
      "description": "Concatenation of state, county, tract, and block group for 2010 Census Block Groups.  Reference: https://www.policymap.com/blog/2012/08/tips-on-fips-a-quick-guide-to-geographic-place-codes-part-iii", 
      "name": "2010 Census Block Group (12-digit FIPS code)"
    }, 

[raprasad]

• [ ] From UX review, remove numbers 1, 2

[raprasad]

Closing. This is covered by new UX/UI ticket #3531