Support org src named blocks

[lhernanz]

Hi team,

Thanks for this very useful tool!

I am aware about a couple of requests around org babel support and a PR (#411), but this one is targeting a different angle. In org babel, you can also name code blocks that you can call as functions. Therefore, I would love for dumb-jump to be able to find them.

Something like the following is doing the trick for me, but this is my first rule, so maybe I did not get it entirely right:

(:type "function" :supports ("ag" "grep" "rg" "git-grep") :language "org"
           :regex "#\\+name:\\s*JJJ\\j"
           ;; \\j usage see `dumb-jump-ag-word-boundary`
           :tests ("#+name: blah" "#+name:blah"))

You can see the specification here