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Remove deprecated tool_serializer parameter #2754

@jlowin

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@jlowin

The tool_serializer parameter on FastMCP and the serializer parameter on tools were deprecated in v3.0.0.

Deprecation PR: #2753

Users should return ToolResult from their tools for explicit control over serialization. See Custom Serialization for examples.

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    breaking changeBreaks backward compatibility. Requires minor version bump. Critical for maintainer attention.enhancementImprovement to existing functionality. For issues and smaller PR improvements.serverRelated to FastMCP server implementation or server-side functionality.v3Targeted for FastMCP 3

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