Add some missing type libraries for mypy (#9657)

* add some missing types

* install pkg-config

* install pkg-config for docker too

* add pkg-config to plugins

* pkg-config when cryptography may need to be built

* deps cleanup

* more comments

* more tweaks

tools/snap/generate_dnsplugins_snapcraft.sh

@@ -47,6 +47,7 @@ parts:
       - libffi-dev
       - python3-dev
       - cargo
+      - pkg-config
   certbot-metadata:
     plugin: dump
     source: .