This is the minimal required for a user to use conditional breakpoint -
we add an options dict to each breakpoint (line and function) and allow
the condition to be supplied. We add a plug mapping and a default
shortcut (<leader><F9>) to add one where we ask the user to enter the
condition and hit expression. This isn't great but it works.
We don't check the capabilities, so they would just be ignored if used
on a server that doesn't support them. We also ask for a hit expression
which most users won't understand so this isn't ideal either.
No tests yet.
Very very basic inital checkin to show a way to talk to/from a Vim job
using python (mainly), and to parse the sort of messages that LSP and
VSCode debugger protocol speak (i.e. similar to http messages).
Very hacky, sort of holds together for what it is.
