feat(layout): add Rulemak layout (@poli0iq) (monkeytypegame#6835)

### Description

Add Rulemak Cyrillic layout, as found in
https://gitlab.freedesktop.org/xkeyboard-config/xkeyboard-config/-/blob/23fec5367a042639ed93f7cf3878fbe9ddb84115/symbols/ru#L722.

It's primarily designed for Russian, but can also be used for Ukrainian,
Serbian, Bulgarian, Belarusian and Macedonian, thanks to its layer 3-4
symbols.

### Checks

- [ ] Adding quotes?
- [ ] Make sure to include translations for the quotes in the
description (or another comment) so we can verify their content.
- [ ] Adding a language?
- Make sure to follow the [languages
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/LANGUAGES.md)
  - [ ] Add language to `packages/schemas/src/languages.ts`
- [ ] Add language to exactly one group in
`frontend/src/ts/constants/languages.ts`
  - [ ] Add language json file to `frontend/static/languages` 
- [ ] Adding a theme?
- Make sure to follow the [themes
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/THEMES.md)
  - [ ] Add theme to `packages/schemas/src/themes.ts`
  - [ ] Add theme to `frontend/src/ts/constants/themes.ts`
  - [ ] Add theme css file to `frontend/static/themes`
- [ ] Add some screenshot of the theme, especially with different test
settings (colorful, flip colors) to your pull request
- [x] Adding a layout?
- [x] Make sure to follow the [layouts
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/LAYOUTS.md)
  - [x] Add layout to `packages/schemas/src/layouts.ts`
  - [x] Add layout json file to `frontend/static/layouts` 
- [ ] Adding a font?
- Make sure to follow the [themes
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/FONTS.md)
  - [ ] Add font file  to `frontend/static/webfonts`
  - [ ] Add font to `packages/schemas/src/fonts.ts`
  - [ ] Add font to `frontend/src/ts/constants/fonts.ts`
- [ ] Check if any open issues are related to this PR; if so, be sure to
tag them below.
- [ ] Make sure the PR title follows the Conventional Commits standard.
(https://www.conventionalcommits.org for more info)
- [ ] Make sure to include your GitHub username prefixed with @ inside
parentheses at the end of the PR title.

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Author: poli0iq

frontend/static/layouts/rulemak.json

@@ -0,0 +1,62 @@
+{
+  "keymapShowTopRow": false,
+  "type": "ansi",
+  "keys": {
+    "row1": [
+      ["ё", "Ё"],
+      ["1", "!"],
+      ["2", "\""],
+      ["3", "№", "#", "³"],
+      ["4", ";", "$", "£"],
+      ["5", "%", "€", "%"],
+      ["6", ":"],
+      ["7", "?", "&"],
+      ["8", "*", "₽", "₴"],
+      ["9", "(", "[", "{"],
+      ["0", ")", "]", "}"],
+      ["-", "_", "–", "—"],
+      ["=", "+", "×", "÷"]
+    ],
+    "row2": [
+      ["я", "Я", "ѣ", "Ѣ"],
+      ["ж", "Ж", "ѵ", "Ѵ"],
+      ["ф", "Ф", "ѳ", "Ѳ"],
+      ["п", "П", "п", "П"],
+      ["г", "Г", "ґ", "Ґ"],
+      ["й", "Й", "ј", "Ј"],
+      ["л", "Л", "љ", "Љ"],
+      ["у", "У", "ў", "Ў"],
+      ["ы", "Ы", "ї", "Ї"],
+      ["ю", "Ю", ";", ":"],
+      ["ш", "Ш", "«", "„"],
+      ["щ", "Щ", "»", "“"],
+      ["э", "Э", "’", "”"]
+    ],
+    "row3": [
+      ["а", "А", "'", "ʼ"],
+      ["р", "Р", "®"],
+      ["с", "С", "@"],
+      ["т", "Т", "ћ", "Ћ"],
+      ["д", "Д", "ђ", "Ђ"],
+      ["ч", "Ч", "џ", "Џ"],
+      ["н", "Н", "њ", "Њ"],
+      ["е", "Е", "є", "Є"],
+      ["и", "И", "і", "І"],
+      ["о", "О", "о", "О"],
+      ["ь", "Ь", "ъ", "Ъ"]
+    ],
+    "row4": [
+      ["з", "З", "ѕ", "Ѕ"],
+      ["х", "Х", "х", "Х"],
+      ["ц", "Ц", "©"],
+      ["в", "В", "в", "В"],
+      ["б", "Б", "ѓ", "Ѓ"],
+      ["к", "К", "ќ", "Ќ"],
+      ["м", "М", "м", "М"],
+      [",", ";", "<"],
+      [".", ":", ">"],
+      ["/", "?", "\\", "|"]
+    ],
+    "row5": [[" "]]
+  }
+}

packages/schemas/src/layouts.ts

@@ -218,6 +218,7 @@ export const LayoutNameSchema = z.enum([
     "tarmak_2",
     "tarmak_3",
     "tarmak_4",
+    "rulemak",
   ], 
   {
     errorMap: customEnumErrorHandler("Must be a supported layout"),