Hide long types in error output for better readability

[sairus7]

There are two parts of long type strings:

• Deeply nestred parametric types (with a lot of {} braces).
• Long type names for each individual type (like QueryOperators.GroupColumnArrayView).

For some standard types like arrays or tuples there was a proposal to change their names to a shorter syntax in declarations:

Short type declarations (syntax sugar)?

Thanks for the interesting historical tangent! In this context, I have to ask: Why did we decide against {T1,T2} as a shorthand for Tuple{T1,T2}? Very naively, this syntax looks free (Error: syntax: { } vector syntax is discontinued), natural, and the current Tuple{...} is pretty verbose.