[torch::deploy] remove asserts from deploy (#73456)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73456
Replaces `at::Error` with a more simple implementation of exceptions in order to reduce the dependency of torch::deploy on torch.
Note: Internal Testing / changes are still needed
Test Plan: Imported from OSS
Reviewed By: samdow
Differential Revision: D34868005
Pulled By: PaliC
fbshipit-source-id: c8bb1f7a2b169b5a8e3b63a697e0ced748a0524c
(cherry picked from commit 51b3763d16e74458a5cfb8e4d660806dea897617)
