add new pydantic-based plugin system

archivebox/plugantic/__init__.py

@@ -0,0 +1,17 @@
+__package__ = 'archivebox.plugantic'
+
+from .binproviders import BinProvider
+from .binaries import Binary
+from .extractors import Extractor
+from .replayers import Replayer
+from .configs import ConfigSet
+from .plugins import Plugin
+
+# __all__ = [
+#     'BinProvider',
+#     'Binary',
+#     'Extractor',
+#     'Replayer',
+#     'ConfigSet',
+#     'Plugin',
+# ]