feat(void): add Bedrock provider in onboarding + type updates

[vrtnis]

adds bedrock to onboarding and wiring..updated types + capability list, and points llm calls at the gateway..to address #508

[day-mon]

+1 to get this merged in

[andrewpareles]

Merged, but realized this is just a copy of OpenAI Compatible. Can we somehow create a nice config for https://github.com/aws-samples/bedrock-access-gateway so that users don't have to figure it out themselves?