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Douglas Creager 2c3b3d3230 [ty] Create separate FunctionLiteral and FunctionType types (#18360 )

This updates our representation of functions to more closely match our
representation of classes.

The new `OverloadLiteral` and `FunctionLiteral` classes represent a
function definition in the AST. If a function is generic, this is
unspecialized. `FunctionType` has been updated to represent a function
type, which is specialized if the function is generic. (These names are
chosen to match `ClassLiteral` and `ClassType` on the class side.)

This PR does not add a separate `Type` variant for `FunctionLiteral`.
Maybe we should? Possibly as a follow-on PR?

Part of https://github.com/astral-sh/ty/issues/462

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Co-authored-by: Micha Reiser <micha@reiser.io>

2025-06-03 10:59:31 -04:00