[feature] add support for Symbols Outline

[embe221ed]

Describe the problem

the NvimTree support is a pretty good feature, I would like to ask for a similar feature for Outline plugin.

Describe the solution

Implement similar solution as it is done for NvimTree.

[shortcuts]

Hey @embe221ed thanks for submitting the request :D

I'll take a look once I'm back from my paternity leave, in the meantime if you'd like to add support for it, you can take a look at the hint comment I've put here #297 (comment)

[embe221ed]

hey @shortcuts!

I'll take a look at the hint comment and will try to implement the feature by myself, thanks!

[shortcuts]

Hey, this will be supported in 1.12.0 :)