Add support for lowering info during serialize_module, and add padding/partial to...

Add support for lowering info during serialize_module, and add padding/partial to it (#5810)

Summary:
Pull Request resolved: https://github.com/pytorch/glow/pull/5810

Pull Request resolved: https://github.com/pytorch/pytorch/pull/64725

- Any info added to the dict in node.meta["lowering_info"] will be added to the node_rep during serialization.
- Use this to add annotations on placeholders that allow partial inputs and require padding.
- Check for these annotations and set them in the NNPICompiledFunction as expected

Test Plan: Validated working on inline_cvr in stack. Additionally existing fx_glow end to end tests should still pass.

Reviewed By: 842974287

Differential Revision: D30824192

fbshipit-source-id: def64ef097aa35c337abb494415f7d437c6c7fa9