Non-core datatypes default to text in relational views

[bferguso]

Found while implementing the arches-controlled-lists, the relational views default to text for datatypes that are not in arches core. Need to find a way to allow for external datatypes in the relational views.

Similar to #12069

Initial strategy for this is:

1. Add a value to the d_data_types.defaultconfig JSON which indicates what native Postgres datatype (pgdatatype?) it should resolve to
2. Add a value to the d_data_types.defaultconfig JSON which indicates what Postgres function (pg_value_to_json?) should be used to transform the value in the relational view into JSON for the tiles.tiledata column
3. Remove the hard-coded case statement from the __arches_get_node_value_sql and replace it using the d_data_types.defaultconfig
4. Externalize the datatype-specific logic from the __arches_get_json_data_for_view function to use the function specified in the datatype configuration. This may have negative performance implications, but maybe we can use standard naming conventions to mitigate this?

FYI @robgaston @chiatt