notes: teach the -e option to edit messages in editor

notes: teach the -e option to edit messages in editor

Notes can be added to a commit using:
	- "-m" to provide a message on the command line.
	- -C to copy a note from a blob object.
	- -F to read the note from a file.
When these options are used, Git does not open an editor,
it simply takes the content provided via these options and
attaches it to the commit as a note.

Improve flexibility to fine-tune the note before finalizing it
by allowing the messages to be prefilled in the editor and edited
after the messages have been provided through -[mF].

Signed-off-by: Abraham Samuel Adekunle <abrahamadekunle50@gmail.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>