tools/mpremote: Add mpremote mip install to install packages.

This supports the same package sources as the new `mip` tool.
 - micropython-lib (by name)
 - http(s) & github packages with json description
 - directly downloading a .py/.mpy file

The version is specified with an optional `@version` on the end of the
package name. The target dir, index, and mpy/no-mpy can be set through
command line args.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

docs/reference/mpremote.rst

@@ -146,6 +146,14 @@ The full list of supported commands are:
   variable ``$EDITOR``). If the editor exits successfully, the updated file will
   be copied back to the device.
 
+- install packages from :term:`micropython-lib` (or GitHub) using the ``mip`` tool:
+
+  .. code-block:: bash
+
+      $ mpremote mip install <packages...>
+
+  See :ref:`packages` for more information.
+
 - mount the local directory on the remote device:
 
   .. code-block:: bash
@@ -269,3 +277,9 @@ Examples
   mpremote cp -r dir/ :
 
   mpremote cp a.py b.py : + repl
+
+  mpremote mip install aioble
+
+  mpremote mip install github:org/repo@branch
+
+  mpremote mip install --target /flash/third-party functools