Add support for tuple parameters

[raddevon]

https://github.com/edgedb/edgedb/pull/4489 added support for tuples as parameters on the server, but I'm not able to use this in the CLI REPL (version 3.0.0-dev.922+d8320e6). This query:

select <tuple<str, bool>>$var;

gives me this error:

Unimplemented input type descriptor: Tuple(TupleTypeDescriptor { id: 93ae25b7-b85c-8007-f485-25bc9a227e76, element_types: [TypePos(0), TypePos(1)] })