Added scid_str as a string representation of chan_id,
replacing chan_id with scid, and including chan_id(BOLT02)
in lncli listchannels output.
Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>
We want to export some of our CLI code to re-use in other projects. But
in Golang you cannot import code from a `main` package.
So we need to move the actual code into its own package and only have
the `func main()` in the `main` package.
