✨ [MLIR] Decouple Pass and Dialect Plugin

[ystade]

Problem Statement

When loading a MLIR plugin, the optimization tool must be provided with two options --load-pass-plugin and --load-dialect-plugin. As of now, we pass the same .dylib to both options.

Proposed Solution

I am not certain whether this gives any advantage but it might be worth it to try out to decouple the pass and dialect plugin into two separate dynamic libraries.