fix: visual editor lg template don't show

[zhixzhan]

Description

In #1700 , visual editor lg templates were not shown because of the getLgTemplate api in ShellApi was broken. This PR fixes this issue by adding a mapper inside 'getLgTemplate' for converting the LgTemplate object with prototype to a plain object.

According to the The structured clone algorithm, Function objects cannot be duplicated accross windows; attempting to do so will throw a DATA_CLONE_ERR exception.

fixes this by get lg templates from shellData.

Task Item

Fix #1700

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have functionally tested my change

Screenshots

Please include screenshots or gifs if your PR include UX changes.

[zhixzhan]

@yeze322 I removed getLgTemplates method from shellApi, then get templates from existed shellData, can you take a look, what if i missed something ?

[yeze322]

@yeze322 I removed getLgTemplates method from shellApi, then get templates from existed shellData, can you take a look, what if i missed something ?

Looks good to me. ShellData in visual editor is already outdated, it's a good change.