feat(baseModel): adding serialize to offload work from toJSON method

The toJSON method is meant to be overwritten for having custom serialize
behavior. However, re-writing the entire logic of serialize  is not
desired, that's why we move all the logic to serialize method and
to toJSON works as an alias by default

adonis-typings/model.ts

@@ -212,6 +212,7 @@ declare module '@ioc:Adonis/Lucid/Model' {
 
     save (): Promise<void>
     delete (): Promise<void>
+    serialize (): ModelObject
     toJSON (): ModelObject
   }
 

src/Orm/BaseModel/index.ts

@@ -778,7 +778,7 @@ export class BaseModel implements ModelContract {
   /**
    * Converting model to it's JSON representation
    */
-  public toJSON () {
+  public serialize () {
     const Model = this.constructor as typeof BaseModel
     const results = {}
 
@@ -806,6 +806,14 @@ export class BaseModel implements ModelContract {
     return results
   }
 
+  /**
+   * Returns the serialize method output. However, any model can overwrite
+   * it to define it's custom serialize output
+   */
+  public toJSON () {
+    return this.serialize()
+  }
+
   /**
    * Returns the query for `insert`, `update` or `delete` actions.
    * Since the query builder for these actions are not exposed to