feat: Add `cp` builtin to shell for Windows #14078

Job	Run time
macOS Dependencies (native, aarch64, bun-darwin-aarch64, bun-obj-darwin-aarch64, bun-obj-darwin-a...	3m 0s
macOS Zig Object (native, aarch64, bun-obj-darwin-aarch64)	14m 17s
macOS C++ (native, aarch64, bun-darwin-aarch64, bun-obj-darwin-aarch64, bun-obj-darwin-aarch64, m...	13m 6s
macOS Link (native, aarch64, bun-darwin-aarch64, bun-obj-darwin-aarch64, bun-darwin-aarch64, bun-...	5m 8s
Tests bun-darwin-aarch64	15m 10s
	50m 41s

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