[jit] make clone works for interface type (#42121)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42121
This PR changes the Module API to allow register a module with module
interface type, and therefore allows Module::clone works on the case
where there's a module interface type being shared by two submodules.
interface type will be shared by the new cloned instance in the same
compilation unit bc it only
contains a list of functionSchema, which does not involve any
attributes compared to classType.
fixes https://github.com/pytorch/pytorch/issues/41882
Test Plan: Imported from OSS
Reviewed By: suo
Differential Revision: D22781205
Pulled By: wanchaol
fbshipit-source-id: f97f4b75970f0b434e38b5a1f778eda2c4e5109b
