fix: Fix PostgreSQL numeric type mapping in goctl model generation (#4992)

Co-authored-by: 李安琳 <[email protected]>

Author: AnlynnLee

tools/goctl/config/default.yaml

@@ -10,6 +10,9 @@ model:
     decimal:
       null_type: sql.NullFloat64
       type: float64
+    numeric:
+      null_type: sql.NullFloat64
+      type: float64
     double:
       null_type: sql.NullFloat64
       type: float64

tools/goctl/model/sql/model/postgresqlmodel.go

@@ -9,8 +9,6 @@ import (
 
 var p2m = map[string]string{
 	"int8":        "bigint",
-	"numeric":     "double",
-	"decimal":     "double",
 	"float8":      "double",
 	"float4":      "float",
 	"int2":        "smallint",