Support listing Slack groups

Author: illicitonion

Cargo.lock

@@ -37,7 +37,9 @@ secrecy = "0.10"
 serde = { version = "1", features = ["derive"] }
 serde-env-field = "0.3.2"
 serde_json = "1"
+serde_urlencoded = "0.7.1"
 sheets = "0.7.0"
+slack-with-types = "0.1.0"
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
 tower = "0.5.2"
 tower-http = { version = "0.6.6", features = ["fs"] }