[FEATURE] Add model limitation to connector

[ylwu-amzn]

Model has its own limitation. For example LLM generall have a upper limit of token number; multi-modal model may have limitation on image size.

One option is we can add limitation to connector. So user can define what's the limit of the model. Sometimes the limit could be a business decision for example a model can accept big image with size 50MB, but user may consider that's too much for their use case, they may prefer to define the limit as 1MB.