Support for Arrays and Dictionaries in Playground V2

[fotescodev]

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1. Implement Array Support
2. Implement Dictionary Support

Notes:

• array of simple types is already supported, but user needs to type in array in single text input.
  • example: ["item one", "item two", "item three"]

[bthaile]

Need UI design for how to handle Arrays and Dictionary Support.
It can be very complicated to convert

transaction(strings: [String])
...

need form where user can 1 or more values to an array.
Also need validation so that user doesn't put in numbers instead of strings. We could use current validation, just mentioning it.

Dictionary is much more complicated since Dictionary could be made up of complex types. So we'd have to restrict it to basic types.

transaction(keyValuePairs: {UInt64: String}) {
...

How would the input form look for a dictionary? and what if instead of String it was a String array?

There variations need to be designed out.