[META] ML Inference Processor Enhancements III

[mingshl]

Is your feature request related to a problem?

• template query --targeting 2.19
• ml inference search request extension --targeting 2.19
  load image from url function in Connector (PIL.image) -- supporting image search and CLIP
• save memory --- supporting conversational search --targeting 3.1
• hide/remove field search response processor --targeting 3.1

All META Issues for ML Inference Processor:
#2839
#2878

What alternatives have you considered?
A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?
#2173

[brianf-aws]

Linking #3152 as it relates to image support