Streaming responses not supported for Bedrock models

[jaginn]

Several Bedrock models (but not all) support streaming responses but DevoxxGenie does not currently support this.

@stephanj I have implemented in a branch but would appreciate your input on configuration. Some options:

1. Repurpose/rename the existing 'Local Large Language Model' => 'Enable Stream Mode' checkbox such that it applies to all models. E.g. rename to 'Model Response' => 'Enable Stream Mode'. Currently this configuration checkbox impacts Bedrock models anyway.

2. New configuration checkbox specifically to enable streaming responses for Bedrock models.

Cheers,
John