Include hierarchical mimetype check

## Describe the proposal

We do mime type checks in the code (especially in PubSub). The logic now is naive, it would be more future proof to have a hierarchical comparison solution. This library has hierarchy of mime types, for example: https://github.com/gabriel-vasile/mimetype

Example of logic we have currently for mimetype: https://github.com/dapr/components-contrib/pull/631/files

Ideally, we would reuse a library and not implement our own hierarchy.

Note: this issue does not include mimetype detection, this is just for the comparison logic.
Note2: this issue is NOT proposing to use content type detection but to *REUSE* the mimetype hierarchy from an existing library.