Anthropic streaming functions can't handle tool use blocks

[lonelycode]

The anthropic streaming processing does not handle the set of blocks that send tool use and input data, and the handler fails if it tries.

[lonelycode]

I would open a PR, but I have merged all my fixes into my main branch :-/

[corani]

You can still create a branch from your local main and use that to create a PR :)

[rainu]

I picked up the work from @lonelycode and made an PR out of this: https://github.com/tmc/langchaingo/pull/1193