Add `--additional-endpoints` option
Add `--additional-endpoints` option

This is useful when shipping an executable via conda and jrun.
Example:

exec=jrun <jrun and jvm options> exec-name <exec-args>

Users can then call
exec --additional-endpoints endpoints [other args] -- <exec-args>
to add jars/endpoints as needed

ctrueden/jrun,ctrueden/jrun