feat: add support for task-augmented MCP tools

[LucaButBoring]

Implements basic support for task-augmented tool calls in MCP. This just swaps the callTool() invocation for callToolStream(). It has not yet been determined if this should be gated by an option or not.

Description

Swaps the callTool() invocation for callToolStream() to support using task-augmented tools.

Related Issues

#356

Documentation PR

N/A (unless we decide to put this under an option)

Type of Change

New feature

Testing

How have you tested the change?

• I ran npm run check

Also spot-checked against https://github.com/LucaButBoring/simple-tasks-test.

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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