feat: Add `cp` builtin to shell for Windows #14105

Job	Run time
macOS C++ (haswell, x86_64, bun-darwin-x64, bun-obj-darwin-x64, macos-12-large, bun-obj-darwin-x64)	16m 44s
macOS Zig Object (haswell, x86_64, bun-obj-darwin-x64)	13m 26s
macOS Dependencies (haswell, x86_64, bun-darwin-x64, bun-obj-darwin-x64, macos-12-large, bun-obj-...	3m 49s
macOS Link (haswell, x86_64, bun-darwin-x64, bun-obj-darwin-x64, bun-darwin-x64, macos-12-large, ...	8m 44s
Tests bun-darwin-x64	18m 43s
	1h 1m 26s

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