chore: configure eslint (#123)

Added `eslint` to project and configured it. The fixes will be applied later.
```
Found 1855 problems (709 errors, 1146 warnings) 🙈 
628 errors and 291 warnings potentially fixable with the `--fix` option.
```

.eslintignore

@@ -0,0 +1,2 @@
+**/dist/**
+**/node_modules/**

.eslintrc.json

@@ -0,0 +1,27 @@
+{
+    "root": true,
+    "env": {
+        "browser": true,
+        "es2020": true
+    },
+    "plugins": [
+        "@typescript-eslint",
+        "eslint-plugin-import"
+    ],
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "prettier"
+    ],
+    "rules": {
+        "no-misleading-character-class": "warn",
+        "no-dupe-else-if": "warn",
+        "no-warning-comments": "warn",
+        "import/no-absolute-path": "warn",
+        
+        "@typescript-eslint/no-explicit-any": "off",        
+        "@typescript-eslint/ban-ts-comment": "off",      
+        "@typescript-eslint/ban-types": "off",      
+        "@typescript-eslint/no-unused-vars": "off"
+    }
+}

package.json

@@ -15,7 +15,10 @@
     "dev": "node ./scripts/dev",
     "bootstrap": "lerna bootstrap --no-ci",
     "postinstall": "lerna bootstrap --no-ci",
-    "docs": "jsdoc -c jsdoc.json"
+    "docs": "jsdoc -c jsdoc.json",
+    "lint": "eslint packages/**/**.ts",
+    "lint:fix": "eslint --fix packages/**/**.ts",
+    "prettier": "prettier --write packages/*/src/**/*.ts"
   },
   "devDependencies": {
     "@babel/core": "^7.16.0",
@@ -24,6 +27,8 @@
     "@babel/preset-react": "^7.16.0",
     "@babel/preset-typescript": "^7.16.0",
     "@lerna/filter-options": "^4.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.39.0",
+    "@typescript-eslint/parser": "^5.39.0",
     "babel-loader": "^8.2.3",
     "better-docs": "^2.3.2",
     "cross-env": "~7.0.3",
@@ -31,7 +36,7 @@
     "file-loader": "^6.2.0",
     "jsdoc": "^3.6.7",
     "lerna": "^4.0.0",
-    "prettier": "^2.5.0",
+    "prettier": "^2.7.1",
     "style-loader": "^3.3.1",
     "typedoc": "^0.23.15",
     "typescript": "^4.8.3",