feat: Add `cp` builtin to shell for Windows #14115

Job	Run time
macOS C++ (haswell, x86_64, bun-darwin-x64, bun-obj-darwin-x64, macos-12-large, bun-obj-darwin-x64)	15m 41s
macOS Dependencies (haswell, x86_64, bun-darwin-x64, bun-obj-darwin-x64, macos-12-large, bun-obj-...	3m 40s
macOS Zig Object (haswell, x86_64, bun-obj-darwin-x64)	12m 58s
macOS Link (haswell, x86_64, bun-darwin-x64, bun-obj-darwin-x64, bun-darwin-x64, macos-12-large, ...	8m 37s
Tests bun-darwin-x64	14m 6s
	55m 2s

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