Abstract graph fix, round 4

[f-aguzzi]

Describe the bug
We had many issues and pull requests pop up because the logic in the abstract graph is still unclear and some cases are handled wrong.

These issues include, but are not limited to:

• v1.14.1 ValueError: Unsupported model_provider='groq/xxxxx' #587 and fix: abstract graph #589 (groq)
• Add anthropic integration #581 (anthropic was already integrated, but there were problems accessing it)
• TypeError: Expected a Runnable, callable or dict.Instead got an unsupported type: <class 'str'> #588 (model instances?)
  and older examples:
• AbstractGraph is broken once again #572

This is because we tried to keep the ability to pick models without specifying the provider, but that's only been a source of problems.

To Reproduce
Pick a model (gpt, groq, vertex, mistral) without specifying the provider.

Expected behavior
We should remove the possibility to pick a model without specifying the provider, and throw error messages accordingly. This might be seen as a (partially) breaking change.

Proposed solution
In the upcoming comments.

[f-aguzzi]

stateDiagram-v2
    [*] --> split_name
    split_name --> is_supported

    note right of split_name
    model_name -->
    provider + model
    end note

    is_supported --> check_tokens : provider exists
    is_supported --> throw_error : provider not supported
    throw_error --> [*] : exit with error

    state is_tokens <<fork>>
    state tokens_done <<join>>
    check_tokens --> is_tokens
    is_tokens --> tokens_provided : read from tokens dict
    is_tokens --> tokens_not_provided : set default tokens
    tokens_not_provided --> throw_warning
    tokens_provided --> tokens_done
    throw_warning --> tokens_done

    state instancing <<fork>>
    state end_instancing <<join>>
    tokens_done --> check_list
    check_list --> instancing
    instancing --> init_chat_model : yes
    instancing --> instance_manually : no
    init_chat_model --> end_instancing
    instance_manually --> end_instancing

    end_instancing --> [*] : exit correctly

    note right of check_list
    model supported by
    init_chat_model?
    end note

    note right of check_tokens
    check models_tokens
    dictionary for model
    end note

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[github-actions]

🎉 This issue has been resolved in version 1.15.0-beta.6 🎉

The release is available on:

• v1.15.0-beta.6
• GitHub release

Your semantic-release bot 📦🚀

[VinciGit00]

please update to the new beta

[github-actions]

🎉 This issue has been resolved in version 1.15.1-beta.1 🎉

The release is available on:

• v1.15.1-beta.1
• GitHub release

Your semantic-release bot 📦🚀