[META] ML Inference Processor Enhancements III

[mingshl]

Is your feature request related to a problem?

• [x] template query --targeting 2.19
• [x] 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 3.0
• [ ] hide/remove field search response processor --targeting 3.0

All META Issues for ML Inference Processor: https://github.com/opensearch-project/ml-commons/issues/2839 https://github.com/opensearch-project/ml-commons/issues/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