cp: require preserve only certain attributes (#4099)

* cp: require preserve only certain attributes

# Conflicts:
#	src/uu/cp/src/copydir.rs
#	src/uu/cp/src/cp.rs

* tests/cp: preserve all and preserve xattr tests with todos

* tests/cp: rename preserve tests

* tests/cp: add android fail test for preserve=xattr

On Android, this cp with explicit preserve of xattr must fail, because of the limitations of the filesystem setup used on Android.

* cp: verify some metadata in cp preserve tests

# Conflicts:
#	tests/by-util/test_cp.rs

* cp: run test_cp_preserve_all in all OS's but only check metadata on linux

* test/cp: don't expect the mode to change in explicit cp preserve

* cp: attributes struct instead of enum for unified required tracking

* cp: refactor preserver and handle_preserve

# Conflicts:
#	src/uu/cp/src/cp.rs

* cp: update preserve attr to max

* test/cp: fix the preserve xattr test

Access timestamps appear to be modified only in this test. Running the command directly does not alter the access timestamp.

* cp/test: preserve all and context case

* cp: fix preserve args value source

* test/cp: don't check mtime on freebsd

* test/cp: don't check mtime on macos

* test/cp: fix freebsd deps

* test/cp: support freebsd tests

* cp: simplify try_set_from_string

* cp: parse context attr in preserve in any case to show warning later

* cp: print warnings for attribute errors if not required

* cp: show SELinux warning only once

* cp: show SELinux warning without error

* Revert "cp: show SELinux warning without error"

This reverts commit d130cf0d8c8e28ac2c903413992613241decf879.

* cp: add documentation for preserve components

* cp: simplify try_set_from_string

* cp: EN_US "behavior" spelling for cspell

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