Add wordcloud package recipe for emscripten-wasm32

[Copilot]

Adds a complete recipe for the wordcloud package (v1.9.4) to support WebAssembly builds in emscripten-forge.

Key features:

• Full Python word cloud generation library
• Includes Cython extensions for performance
• Dependencies: numpy, pillow, matplotlib (all available in emscripten-forge)
• MIT licensed with proper metadata

Technical details:

• Handles Cython build requirements (cython >=0.29.33, setuptools, setuptools_scm)
• Includes C++ compiler for native extensions
• Simple import test for validation
• Uses standard emscripten-forge recipe patterns

Fixes #2755

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[DerThorsten]

@copilot try again

[Copilot]

@copilot try again

Fixed the wordcloud recipe by adding missing Cython build dependencies. The recipe now includes cython >=0.29.33, setuptools, and setuptools_scm as build requirements, which are needed for the package's Cython extensions. Commit: 092edb5

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