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

Job	Run time
macOS C++ (nehalem, x86_64, bun-darwin-x64-baseline, bun-obj-darwin-x64-baseline, macos-12-large,...	16m 53s
macOS Dependencies (nehalem, x86_64, bun-darwin-x64-baseline, bun-obj-darwin-x64-baseline, macos-...	3m 51s
macOS Object (nehalem, x86_64, bun-obj-darwin-x64-baseline)	13m 38s
macOS Link (nehalem, x86_64, bun-darwin-x64-baseline, bun-obj-darwin-x64-baseline, bun-darwin-x64...	8m 35s
macOS Test	0s
	42m 57s

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