anthropic[minor]: Implement actual anthropic tool call streaming (#6056)

* anthropic[minor]: Implement actual anthropic tool call streaming

* chore: lint files

* chore: lint files

* chore: lint files

* I broke it

* core[minor]: Allow concatenation of messages with multi part content

* cr

* cr

* proper streaming

* fixed

* cleanup

* add comment

* add tool call type field

* Fix test

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Co-authored-by: jacoblee93 <jacoblee93@gmail.com>