[mlir][Pass] Enable printing pass options as part of `-help`.

Summary:
This revision adds support for printing pass options as part of the normal help description. This also moves registered passes and pipelines into different sections of the help.

Example:
```
  Compiler passes to run
    --pass-pipeline                                     -   ...
    Passes:
      --affine-data-copy-generate                       -   ...
      --convert-gpu-to-spirv                            -   ...
        --workgroup-size=<long>                         - ...
      --test-options-pass                               -   ...
        --list=<int>                                    - ...
        --string=<string>                               - ...
        --string-list=<string>                          - ...
    Pass Pipelines:
      --test-options-pass-pipeline                      -   ...
        --list=<int>                                    - ...
        --string=<string>                               - ...
        --string-list=<string>                          - ...
```

Differential Revision: https://reviews.llvm.org/D74246