feat: add description text to operators and extract the useFetchModelId to logicHooks.ts and drag the operator to the canvas and initialize the form data #918 (#1379)

### What problem does this PR solve?

feat: add description text to operators #918 
feat: drag the operator to the canvas and initialize the form data #918
feat: extract the useFetchModelId to logicHooks.ts
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/flow/list/index.less

@@ -56,6 +56,6 @@
 }
 
 .templatesBox {
-  max-height: 500px;
+  // max-height: 500px;
   overflow: auto;
 }