Gray Studio Think65 v3 Layout Additions (#21930)

* Add layout/matrix diagram

[docs]

* Format `info.json` as strict JSON

[style]

* Add `LAYOUT_all`

[enhancement]

* Refactor keymaps to use `LAYOUT_all`

Refactor the `default` and `via` keymaps to use the `LAYOUT_all` macro.

- change second Left Shift key to `KC_NUBS`
- insert `KC_NUHS` keycode
- update keycode grid alignment
- remove trailing whitespace

[refactor]

* Rename `LAYOUT_65_blocker` to `LAYOUT_ansi_blocker`

[refactor]

* Rename `LAYOUT_65_iso_blocker` to `LAYOUT_iso_blocker`

[refactor]

* Correct `LAYOUT_iso_blocker` matrix data

The Quote key was mapped as [1, 14] instead of [2, 12].

[bugfix]

* Add `LAYOUT_ansi_blocker_split_bs`

[enhancement]

* Add `LAYOUT_ansi_blocker_tsangan_split_bs`

[enhancement]

* Add `LAYOUT_ansi_blocker_tsangan`

[enhancement]

* Add `LAYOUT_iso_blocker_split_bs`

[enhancement]

* Add `LAYOUT_iso_blocker_tsangan_split_bs`

[enhancement]

* Add `LAYOUT_iso_blocker_tsangan`

[enhancement]