Add dynamic completion for users and databases

src/core/protocol/commands/complete_database_name.rs

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+use crate::core::types::MySQLDatabase;
+
+pub type CompleteDatabaseNameRequest = String;
+
+pub type CompleteDatabaseNameResponse = Vec<MySQLDatabase>;

src/core/protocol/commands/complete_user_name.rs

@@ -0,0 +1,5 @@
+use crate::core::types::MySQLUser;
+
+pub type CompleteUserNameRequest = String;
+
+pub type CompleteUserNameResponse = Vec<MySQLUser>;