feat(types): create peertube-types package

Create dedicated Typescript "types" configuration file for each "projects".
Create a types folder which includes every useful ts definition:
- client
- server
- shared
Add tooling to create a proper package, extract dependencies, etc...
Add CI Github task.

refactor(types): publish types package in release script

tsconfig.base.json

@@ -12,6 +12,7 @@
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
     "lib": [
+      "dom",
       "es2015",
       "es2016",
       "es2017",
@@ -20,6 +21,7 @@
     ],
     "typeRoots": [
       "node_modules/@types",
+      "client/node_modules/@types"
     ],
     "baseUrl": "./",
     "outDir": "./dist/",