[NNC] API for Buffer Compression (#55853)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/54338
This PR adds the following API in NNC to implement "buffer compression".
```
static void compressBuffer(Buf* buf, Stmt* stmt);
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55853
Reviewed By: ezyang
Differential Revision: D27960986
Pulled By: navahgar
fbshipit-source-id: a69988e607196f3e2db0212313ea5deefb9859ac
