different bitrate for different channels

### Is your feature request related to a problem? Please describe.

Currently, the channel in the Bus class interface supports the list/tuple type, but the bitrate type is int. This will result in the same baud rate for all channels when multiple channels are opened.

I want to configure different baud rates for different channels of the same Bus.
### Describe the solution you'd like

I think the data type of the bitrate interface can extended to support list/tuple types, and is the same as that of channel.
### Describe alternatives you've considered

None
### Additional context

None

### Note
I have not retrieved any similar issure. If there are any duplicates, please let me know and I will close this issure.