util/gmeta: improve meta retrieving performance by adding cache for struct type

[gqcn]

Description

As the meta data if bound to struct type, we can add cache for meta data of the struct type in package gmeta instead of parsing the same struct again and again in runtime.

Additional

No response

[github-actions]

Hello @gqcn. We like your proposal/feedback and would appreciate a contribution via a Pull Request by you or another community member. We thank you in advance for your contribution and are looking forward to reviewing it!
你好 @gqcn。我们喜欢您的提案/反馈，并希望您或其他社区成员通过拉取请求做出贡献。我们提前感谢您的贡献，并期待对其进行审查。