Organization: Refactor SDK as modular monorepo by features/services

Since the repository and projects are growing, we decided to refactor the whole repository as monorepo modular package.

**Packages**
org: `@base-sdk`
- @base-sdk/core
- @base-sdk/database
- @base-sdk/analytics
- @base-sdk/auth
- @base-sdk/design
- @base-sdk/g11n
- @base-sdk/assets
- @base-sdk/hosting