feat: supports decimal type in RPC (#2788)

* refactor: ColumnDataTypeWrapper

* feat: decimal128 grpc

* feat: add test case

* chore: add TODO

* chore: empty line

* chore: remove precision and scale

* refactor: remove precision and scale

* chore: remove sqlness test

* chore: rename

* chore: proto version

* chore: cr comment.

Co-authored-by: Yingwen <realevenyag@gmail.com>

* Update src/mito2/src/memtable/time_series.rs

Co-authored-by: Yingwen <realevenyag@gmail.com>

---------

Co-authored-by: Yingwen <realevenyag@gmail.com>

src/client/examples/logical.rs

@@ -46,6 +46,7 @@ async fn run() {
                 default_constraint: vec![],
                 semantic_type: SemanticType::Timestamp as i32,
                 comment: String::new(),
+                ..Default::default()
             },
             ColumnDef {
                 name: "key".to_string(),
@@ -54,6 +55,7 @@ async fn run() {
                 default_constraint: vec![],
                 semantic_type: SemanticType::Tag as i32,
                 comment: String::new(),
+                ..Default::default()
             },
             ColumnDef {
                 name: "value".to_string(),
@@ -62,6 +64,7 @@ async fn run() {
                 default_constraint: vec![],
                 semantic_type: SemanticType::Field as i32,
                 comment: String::new(),
+                ..Default::default()
             },
         ],
         time_index: "timestamp".to_string(),