Alias dig to search

[jho406]

props_template allows for traversing into a template https://github.com/thoughtbot/props_template?tab=readme-ov-file#traversing. Right now, that ability is enabled using thesearch: option on a block.

json.data(search: traversal_path) do
 .....
end

I would like to alias search to dig as that more closely aligns with the terminology used in https://thoughtbot.github.io/superglue/#/traversal-guide.

Since we don't want to break existing functionality, lets continue to allow search to work. We'll need to update documentation in this repo as well via a quick rename.