REPL: Output format change for list(string)

[l46kok]

Describe the bug
In REPL, it's currently not possible to distinguish whether an outputted list of strings are multiple elements in a list or the string itself contains a space:

cel-repl> ["Hello World"]
[Hello World] : list(string)
cel-repl> ["Hello","World"]
[Hello World] : list(string)

Expected behavior

We could simply wrap the elements of string type with quotes and optionally use comma as a separator:

cel-repl> ["Hello World"]
["Hello World"] : list(string)
cel-repl> ["Hello","World"]
["Hello", "World"] : list(string)

[TristonianJones]

@l46kok if you want to update the Stringer implementation for list and map types, this would probably be worthwhile and address the issue you're seeing in the repl.