Include typehints in pdoc

We use pdoc to generate a reference of the python `glclient`-library.
We suffered some issues related to missing type-hints. The work-around
was to remove the type-hints before generating the docs.

I've found 3 causes of warnings.

1. Missing export of `SignerHandle` (See #368)
2. Poorly defined imports in auto-generated GRPC-code (See
   #369)
3. pdoc failing to import type from type-stubs
   (See mitmproxy/pdoc#671)

All of these 3 issues have been addressed so we don't need the hack
anymore.

Author: ErikDeSmedt

.github/workflows/docs-action.yml

@@ -71,7 +71,6 @@ jobs:
           DOCSREMOTE: "origin"
           GITHUB_TOKEN: "${{ secrets.GH_PAGES_PAT }}"
         run: |
-          rm libs/gl-client-py/glclient/*.pyi
           PATH=$(pwd)/.venv/bin:$PATH make docs
 
       - name: Deploy