[Enhancement] Add a new field additional_info for memory metadata

[Hailong-am]

Is your feature request related to a problem?

I would like have a field to store some additional information about the memory metadata, for example agent id or prompt information into this additional info for the memory metadata

What solution would you like?
A clear and concise description of what you want to happen.

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?
perviously we want to reuse application type and have an issue
#2632, but this field is not intend to expose to end user.

[ylwu-amzn]

I think we should call this as enhancement

[Hailong-am]

close it as PR merged