feat(cp): initial commit of cp from node

I need `fs.cp` in `npm copy` to copy node_modules files. I'm adapting
node's [lib/internal/fs/cp/cp.js][0]. I'm checking in the original so I
can record changes in git.

ref npm/cli#4082

[0]: https://github.com/nodejs/node/blob/1fa507f098ca7a89012f76f0c849fa698e73a1a1/lib/internal/fs/cp/cp.js

LICENSE.md

@@ -16,3 +16,22 @@ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
 USE OR PERFORMANCE OF THIS SOFTWARE.
+
+- node-fs-extra, located at lib/cp/polyfill.js, is licensed as follows:
+  """
+  (The MIT License)
+
+  Copyright (c) 2011-2017 JP Richardson
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
+  (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
+   merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+  OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  """

lib/cp/index.js

@@ -0,0 +1,22 @@
+const fs = require('../fs.js')
+const getOptions = require('../common/get-options.js')
+const node = require('../common/node.js')
+const polyfill = require('./polyfill.js')
+
+// node 16.7.0 added fs.cp
+const useNative = node.satisfies('>=16.7.0')
+
+const rm = async (path, opts) => {
+  const options = getOptions(opts, {
+    copy: ['dereference', 'errorOnExist', 'filter', 'force', 'preserveTimestamps', 'recursive'],
+  })
+
+  // the polyfill is tested separately from this module, no need to hack
+  // process.version to try to trigger it just for coverage
+  // istanbul ignore next
+  return useNative
+    ? fs.rm(path, options)
+    : polyfill(path, options)
+}
+
+module.exports = rm