add watsonx embeddings provider + add granite chat template + add wat…

[mq200]

…sonx models

Description

• add watsonx embeddings provider
• intelliJ @folder: enable selection of nested folders
• add granite chat template
• add all granite code models
• fix missing watsonx icon in intelliJ plugin
• fix @codebase behavior not respecting configured nFinal/nRetrieve (n being used as num files instead of num chunks for recently edited files)

Checklist

• [x] The base branch of this PR is dev, rather than main
• [x] The relevant docs, if any, have been updated or created