FJLabs Avalon Layout Additions and Touch-Up (#20620)
* add matrix_diagram.md
* info.json: correct key sequence
Fixes an off-by-one error between Right Split Backspace and Enter.
* refactor and unify keymaps
Edit the `default` and `via` keymaps for consistency layer-to-layer, to each other, and to the `info.json` layout data.
* info.json: apply friendly formatting
* add LAYOUT_ansi_blocker_split_bs
* add LAYOUT_ansi_blocker
* add LAYOUT_ansi_blocker_tsangan_split_bs
* add LAYOUT_ansi_blocker_tsangan
* add LAYOUT_iso_blocker_split_bs
* add LAYOUT_iso_blocker
* add LAYOUT_iso_blocker_tsangan_split_bs
* add LAYOUT_iso_blocker_tsangan
* add layout reference keymaps
* info.json: remove extra line breaks
* edit maintainer value
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