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

shared/tsconfig.types.json

@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../types/shared",
+    "stripInternal": true,
+    "removeComments": false,
+    "emitDeclarationOnly": true
+  }
+}