[RFC] Modularize functions of parsing bytecode (#61862)

[RFC] Modularize functions of parsing bytecode (#61862)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61862

Modularize functions of parsing bytecode tables so that they can be used as needed in situations other than mobile lite interpreter.
* The decoupled functions are re-used by current lite interpreter loader.
* The bytecode can be serialized/deserialized from other formats.
* The decoupled functions have minimum dependencies on other PyTorch components.

Next:
Build a driver binary to include the parser and interpreter, but only has necessary dependency on other PyTorch components.
ghstack-source-id: 137867287

Test Plan:
As an example, a simple bytecode is parsed to a mobile function, and directly run in the added unit test, `RunTimeTest:ParseBytecode`. It contains basic control flow (if, else) and basic data orchestration (list construction).
CI

Reviewed By: larryliu0820

Differential Revision: D29798382

Pulled By: iseeyuan

fbshipit-source-id: 1c173a5f5d37097e3a97baec3f3e48e1eea1400f