feat: export more types

[yuyinws]

🔍 What type of PR is this?

Optimization types. User can import more types from this pkg directly.

After

import { GroupApplicationItem } from 'open-im-sdk-wasm/lib/types/entity'

Before

import { GroupApplicationItem } from 'open-im-sdk-wasm'

👀 What this PR does / why we need it:

• [x] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [x] All the tests have passed

🅰 Which issue(s) this PR fixes:

Fixes #

📝 Special notes for your reviewer:

🎯 Describe how to verify it

📑 Additional documentation e.g., RFC, notion, Google docs, usage docs, etc.:

[Bloomingg]

In fact, my original intention is to distinguish between methods, enums, and types.The reason why enum can be imported from the root path is because if not, it will not be compiled.