QK65 Solder Community Layout Support (qmk#16796)

* refactor solder.h

- use QMK 3-character notation
- convert tabs to spaces

* solder.h: add matrix diagram

* rename LAYOUT_solder to LAYOUT_all

* rename LAYOUT_iso to LAYOUT_65_iso_blocker

Also adds Community Layouts rule to `rules.mk`.

* info.json: improve formatting

- convert tabs to spaces
- format file to four-space indent

* refactor keymaps

- convert tabs to spaces
- update grid alignment of keycodes
- remove trailing whitespace

* add LAYOUT_65_ansi_blocker

* add LAYOUT_65_ansi_blocker_split_bs

* add LAYOUT_65_iso_blocker_split_bs

* add LAYOUT_65_ansi_blocker_tsangan

* add LAYOUT_65_iso_blocker_tsangan

* add LAYOUT_65_ansi_blocker_tsangan_split_bs

* add LAYOUT_65_iso_blocker_tsangan_split_bs

* remove 65_ansi_blocker_tsangan_split_bs from `LAYOUTS` rule