chore: update typescript to 4.x and gts to 3.x (#336)

Update typescript and gts to new major versions.

Additionally update eslint and plugins to latest versions and fix some other minor issues like repository field in package.json.

packages/opentelemetry-propagator-jaeger/package.json

@@ -4,7 +4,7 @@
   "description": "OpenTelemetry Jaeger propagator provides HTTP header propagation for systems that are using Jaeger HTTP header format.",
   "main": "build/src/index.js",
   "types": "build/src/index.d.ts",
-  "repository": "open-telemetry/opentelemetry-js",
+  "repository": "open-telemetry/opentelemetry-js-contrib",
   "scripts": {
     "test": "nyc ts-mocha -p tsconfig.json 'test/**/*.test.ts' --exclude 'test/index-webpack.ts'",
     "test:browser": "nyc karma start --single-run",
@@ -49,7 +49,7 @@
     "@types/sinon": "9.0.4",
     "@types/webpack-env": "1.15.2",
     "codecov": "3.7.1",
-    "gts": "2.0.2",
+    "gts": "3.1.0",
     "istanbul-instrumenter-loader": "3.0.1",
     "karma": "5.1.0",
     "karma-chrome-launcher": "3.1.0",
@@ -66,7 +66,7 @@
     "ts-node": "9.0.0",
     "tslint-consistent-codestyle": "1.16.0",
     "tslint-microsoft-contrib": "6.2.0",
-    "typescript": "3.9.6",
+    "typescript": "4.1.3",
     "webpack": "4.43.0"
   },
   "dependencies": {