Summary

• Moves Statistics.jl from a regular dependency to a weak dependency (extension)
• Reduces the base dependency footprint while maintaining full functionality

Changes

• Moved Statistics from[deps] to[weakdeps] in Project.toml
• CreatedRecursiveArrayToolsStatisticsExt extension module
• Moved Statistics-dependent functions (mean,median,std,var,cov,cor) to the extension
• Added Statistics to test dependencies to ensure tests continue to work

Testing

• Package compiles successfully
• Statistics functions work when Statistics.jl is loaded
• All existing functionality is preserved through the extension mechanism

This is part of a broader effort to reduce dependencies across the SciML stack by converting optional functionality to weak dependencies.

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