feat: go 1.24 generic type aliases

[hpidcock]

In Go 1.24, generic type aliases are added to the language. These are useful for
aliases of a generic type with some of the type params filled out without creating a
new type. See https://tip.golang.org/ref/spec#Alias_declarations

This aims to implement #260 as well as fix #217 by using the type parameters of
the root/first type alias. If the root type alias is not generic, then we can just use
the types.Named of the interface, as this is the instantiation of a generic interface
type.

When we encounter a root/first type alias that is generic, we need to ensure the
same type params are used for the mock implementation. This is because the
types.Named for the generic interface is a instantiation with the type params
filled out (i.e. type args). Some of these type args may be generic types, instantiated
based on the type params of one or many generic type aliases chained together.
The types package has resolved these for us, we just need to use the type params
from the root/first generic type alias.

Implements #260
Fixes #217