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2c3b3d32 - [ty] Create separate `FunctionLiteral` and `FunctionType` types (#18360)

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