feat: System Message Tools

[RomneyDa]

A remake of #5809

• Adds support for tools in the form of system message instructions and response content parsing + tests
• Tools are parsed as they come in, converted to ToolCalls, and on the way out converted back to text. Switching between native and non-native tools is interchangeable with this approach.
• For now, this applies only to models that are NOT known to support native tools
• Adds a warning to the Agent mode dropdown that shows for any models not known to be great with tools (including models that support native tools)

All models can now be used in Agent mode

[netlify]

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