Rename SQLITE_EXTENSIONS to DATASETTE_LOAD_EXTENSION

Closes #2424

Author: simonw

datasette/cli.py

@@ -85,7 +85,7 @@ def sqlite_extensions(fn):
         "sqlite_extensions",
         "--load-extension",
         type=LoadExtension(),
-        envvar="SQLITE_EXTENSIONS",
+        envvar="DATASETTE_LOAD_EXTENSION",
         multiple=True,
         help="Path to a SQLite extension to load, and optional entrypoint",
     )(fn)