[Unity][MSC][Refactor] Reconstruct BYOC and runner

[Archermmt]

This is a pull request for MSC(Multi-System Compile)
RFC: https://discuss.tvm.apache.org/t/rfc-unity-msc-introduction-to-multi-system-compiler/15251/5
Tracking issue: #15233

This PR:

1. Reconstruct the BYOC passes to simplify the layout inference and expr name setting.
2. Change weights in runner from list -> dict, in case to better manage the model parameters.
3. Use hooks to enable customized pre- and post-process in model building.
4. Record training status for tools.
5. Reconstruct config setup process in manager.
6. Change string to mscattr::keys for important tags.

cc @Hzfengsy