Closes #ISSUE Adds the ability to create settings and keymap migrations by mutating `serde_json::Value`s instead of using tree-sitter queries. This (hopefully) will make complicated migrations far simpler to implement. Release Notes: - N/A *or* Added/Fixed/Improved ... --------- Co-authored-by: Smit <heysmitbarmase@gmail.com> Co-authored-by: Smit <smit@zed.dev>