feat: Make the HTMX object available in templates as a global context

from edmondchuc#27

Author: sfermigier

Diff for: flask_htmx/htmx.py

@@ -25,6 +25,11 @@ def init_app(self, app: Flask):
         """Initialise the extension with the Flask app object."""
         app.htmx = self
 
+        @app.context_processor
+        def htmx_context_processor():
+            return {"htmx": self}
+
+
     @property
     def boosted(self) -> bool:
         """:py:obj:`True` if the request came from an element with the `hx-boost`