feat: implement simple plugins

examples/plugins/__main__.py

@@ -0,0 +1,23 @@
+import asyncio
+
+import velum
+
+import sail
+
+client = velum.GatewayClient()
+manager = sail.CommandManager.with_prefix("!")
+manager.bind_to_app(client)
+
+
+async def main():
+    await sail.load_extension(".test_plugin", client=client, command_manager=manager)
+    await client.start()
+
+
+@manager.command()
+async def reload(ctx: sail.Context):
+    await sail.reload_extension(".test_plugin", client=client, command_manager=manager)
+    await client.rest.send_message("Sail", "Done deal.")
+
+
+asyncio.run(main())

examples/plugins/test_plugin.py

@@ -0,0 +1,11 @@
+import sail
+
+plugin = sail.Plugin()
+
+
+@plugin.command()
+async def plugin_command(ctx: sail.Context):
+    await plugin.rest.send_message("Sail", f"Sent from plugin {plugin.name!r}!")
+
+
+load, unload = plugin.entrypoints

sail/__init__.py

@@ -4,6 +4,7 @@
 from sail.errors import *
 from sail.impl.command import *
 from sail.impl.command_manager import *
+from sail.impl.plugin import *
 from sail.internal.typing_utils import Greedy as Greedy
 from sail.internal.typing_utils import JoinedStr as JoinedStr
 from sail.internal.undefined import UNDEFINED as UNDEFINED