feat(package.json): Add lint yarn script + make it a precondition to build all packages.

fmt(tiptap-commands): Fix all ESLint violations with `--fix`

fmt(tiptap-commands): Ignore some ESLint rules on code copied from prosemirror.

fmt(tiptap): Apply ESLint autofix to `tiptap` package sources.

fmt(tiptap-extensions): Fix ESlint violations from `marks`

refactor(tiptap-extensions): Fix ESLint violations for `plugins/Suggestions.js`.

Some of the violations required a bit of restructuring of the code/logic

fmt(tiptap-utils): Fix ESLint violations.

feat(package.json): Add yarn script to lint source code before compiling the examples.

package.json

@@ -8,7 +8,10 @@
     "start": "node ./node_modules/@babel/node/bin/babel-node.js ./build/examples/server.js --env=development",
     "build:packages": "node ./node_modules/@babel/node/bin/babel-node.js ./build/packages/build.js",
     "build:examples": "node ./node_modules/@babel/node/bin/babel-node.js ./build/examples/build.js --env=production",
-    "release": "yarn build:packages && lerna publish"
+    "release": "yarn build:packages && lerna publish",
+    "lint": "eslint ./packages/**/src/**",
+    "prebuild:packages": "yarn lint",
+    "prebuild:examples": "yarn lint"
   },
   "babel": {
     "presets": [