refactor: switch to ESLint flat config, add JSDoc linting (#147)

This commit switches Dysnomia over to ESLint flat config for
futureproofing and better maintainability. For the most part, the
codebase will pass the test suite, apart from a few exceptions
introduced by the stylistic plugin which I believe are reasonable to
include.

Additionally, JSDoc linting was added to maintain proper 
alignment of various features.

.github/workflows/pr.yml

@@ -3,18 +3,9 @@ on: [ pull_request ]
 
 jobs:
   lint:
-    name: Lint ${{ matrix.lang.name }} files
+    name: Lint all files
     runs-on: ubuntu-latest
 
-    strategy:
-      fail-fast: false
-      matrix:
-        lang: 
-          - lang: js
-            name: JavaScript
-          - lang: ts
-            name: TypeScript
-
     steps:
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -24,6 +15,5 @@ jobs:
         uses: actions/checkout@v4
       - name: Install dependencies
         run: npm i --omit=optional
-      - name: Lint ${{ matrix.lang.name }} files
-        run: "npm run lint:${{ matrix.lang.lang }}"
-
+      - name: Lint all files
+        run: "npm run lint"