Add initial decorators support (fixes allure-framework#7).

- Added a separate `allure-decorators` module to allow setting framework-specific Allure implementation explicitly in a client code.
- Created core decorators for the main Allure functions like step, attachments, issue, etc.
- Added a testdeck extension for data-driven tests. Note that testdeck currently supports only Mocha, Jasmine and Jest. Any other integrations should be additionally discussed and designed.
- Updated outdated typescript linter dependencies that caused issues while creating a new module. Note that this update introduced some failures in the other modules (primarily related to shadow/unknown objects), that were fixed within this commit.

package.json

@@ -17,8 +17,8 @@
   },
   "devDependencies": {
     "@types/node": "^14.6.0",
-    "@typescript-eslint/eslint-plugin": "^2.34.0",
-    "@typescript-eslint/parser": "^2.34.0",
+    "@typescript-eslint/eslint-plugin": "^4.1.1",
+    "@typescript-eslint/parser": "^4.1.1",
     "allure-commandline": "^2.13.0",
     "eslint": "^7.21.0",
     "eslint-config-prettier": "^8.3.0",

packages/allure-decorators/.eslintrc.js

@@ -0,0 +1,13 @@
+module.exports = {
+  globals: {
+    __PATH_PREFIX__: true,
+  },
+  env: {
+    browser: true,
+    node: true,
+    es6: true,
+  },
+  extends: [
+    "../../.eslintrc.js",
+  ],
+};

packages/allure-decorators/.npmignore

@@ -0,0 +1,5 @@
+*
+!dist/**
+!package.json
+!*.md
+!*.txt