Integrate type annotations inline into PyJapc

A substantial change to remove the _japc.pyi and replace it with inline type annotations (plus a separate typing pyi file for common definitions).

There were one or two cases where the type annotations weren't fully correct in _japc.pyi. I have fixed the ones that triggered errors with mypy. I do not intend to correct the inherited (and incorrect) callback annotations in this MR.

docs/conf.py

@@ -8,6 +8,7 @@ extensions = [
     'sphinx.ext.viewcode',
     'sphinx.ext.napoleon',
     'sphinx.ext.autosummary',
+    'sphinx.ext.autodoc.typehints',
 ]
 
 
@@ -44,4 +45,6 @@ exclude_patterns = ['build']
 html_theme = 'acc_py'
 
 
-autoclass_content = 'both'
\ No newline at end of file
+autoclass_content = 'both'
+
+autodoc_typehints = "description"
\ No newline at end of file