Enhanced support for lists, maps, strings

[dlvenable]

Is your feature request related to a problem? Please describe.

We have several related requests for transforming maps and lists. We also have the list_to_map and map_to_list processors. Can we combine them somehow?

Describe the solution you'd like

Create a cohesive processor (or set of processors) for supporting array and map transformations.

Issues

• [Feature Request] Conditionally Assign New Field Logic on Record Arrays  #3961
• [Feature Request] Mapping Records within a Record Array #3962
• [Feature Request] Mapping Array to string #3963
• [Feature Request] Mapping String to Array #3964
• [Feature Request] Dynamic Auto-Map #3965
• Combine values under the same key from a list of key-value pairs #3867

[oeyh]

#3867 also falls under this category.