Process thinking blocks with Anthropic provider and write to the Output.

[ferenci84]

Description

Let us see the human-readable parts of the thinking blocks in the LLM output.

This is a first step on the way of full implementation of handling thinking blocks.

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. ]

Testing instructions

Thinking can be enabled in config this way:

   {
      "title": "Anthropic - Claude 3.7 Sonnet (thinking)",
      "model": "claude-3-7-sonnet-latest",
      "provider": "anthropic",
      "apiKey": "xxx",
      "completionOptions": {
        "temperature": 1,
        "topP": 0.999,
        "maxTokens": 8096
      },
      "requestOptions": {
        "extraBodyProperties": {
          "thinking": {
            "type": "enabled",
            "budget_tokens": 2048
          }
        }
      },
      "cacheBehavior": {
        "cacheConversation": true,
        "cacheSystemMessage": true
      }
    },

Watch the Continue - LLM Prompt/Completion output tab.

Next steps

1. The thinking mode doesn't currently work with tool use. The software should add the thinking and redacted_thinking blocks to the conversation history when sending subsequent requests. Tool use requires this, with no tool use, any thinking blocks will be ignored.

2. human-readable thinking blocks could be added to the UI in form of collapsible boxes. This is an example from TypingMind:

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[ferenci84]

I sent other PR: #4426