[Enhancement] Add default multi-modal process function in ml-commons

[zane-neo]

Is your feature request related to a problem?
multi-modal is an already supported feature in neural-search and ml-commons, but now in ml-commons we need to write painless scripts to pre/post-process functions the inputs/outputs of multi-modal requests which is inconvenient for users.

What solution would you like?
We can add default pre/post process functions for multi-modal case so user can use very simple string to configure their connectors.

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?
Add any other context or screenshots about the feature request here.

[dhrubo-os]

@zane-neo are you planning to release this enhancement in 2.15? What's the plan?

[zane-neo]

@zane-neo are you planning to release this enhancement in 2.15? What's the plan?

This will be released in 2.16.