Support for MiniCPM-V 4.5

[eximius313]

Is your feature request related to a problem? Please describe.
Currently your documentation lists minicpm-v-2.6 with MiniCPMv26ChatHandler.
Since MiniCPM-V 4.5 is out - could you please supprt it?

Describe the solution you'd like
MiniCPM-V 4.5 is supported in llama-cpp-python

Describe alternatives you've considered
N/A

Additional context
llama.cpp already supports it Add any other context or screenshots about the feature request here.

[JamePeng]

Hi, I've adapted a chat handler for Minicpm v4.5; you can try it out.

JamePeng@83d5839