Move old plugins (#4721)

crates/old/nu_plugin_to_sqlite/src/nu/mod.rs

@@ -0,0 +1,25 @@
+#[cfg(test)]
+mod tests;
+
+use crate::ToSqlite;
+use nu_errors::ShellError;
+use nu_plugin::Plugin;
+use nu_protocol::{ReturnValue, Signature, Value};
+use nu_source::Tag;
+
+impl Plugin for ToSqlite {
+    fn config(&mut self) -> Result<Signature, ShellError> {
+        Ok(Signature::build("to sqlite")
+            .desc("Convert table into sqlite binary")
+            .filter())
+    }
+
+    fn filter(&mut self, input: Value) -> Result<Vec<ReturnValue>, ShellError> {
+        self.state.push(input);
+        Ok(vec![])
+    }
+
+    fn end_filter(&mut self) -> Result<Vec<ReturnValue>, ShellError> {
+        crate::to_sqlite::to_sqlite(self.state.clone(), Tag::unknown())
+    }
+}

crates/old/nu_plugin_to_sqlite/src/nu/tests.rs

@@ -0,0 +1 @@
+mod integration {}