feat(bedrock): add Cohere Embed v4 model and improve credential handling (Fixes #11823)#11824

cscvenkatmadurai wants to merge 1 commit intoRooCodeInc:mainRooCodeInc/Roo-Code:mainfrom

cscvenkatmadurai:feat/bedrock-cohere-v4-and-credentialscscvenkatmadurai/Roo-Code:feat/bedrock-cohere-v4-and-credentialsCopy head branch name to clipboard