Add an option to modify tree padding/indentation

[charbelnicolas]

I think adding an indent/padding to the tree would be nice.

Describe the solution you'd like

Add an option to modify the padding/indent of children in the tree (components/padding.lua)

function M.get_padding(depth, idx, nodes_number, node, markers) local padding = " "

Describe alternatives you've considered

Editing the source file directly and adding a space " ".

Before:

After:

It looks a bit nicer!

[alex-courtis]

Add an option to modify the padding/indent of children in the tree (components/padding.lua)

view.width.padding can take a function, a similar callback may be added.

Possibility: pass the node to the callback.

[samuelnihoul]

I will try to make the PR.