[WIP][Umbrella][zh-cn] Translation for Scala 3 Book

[byyue]

Progressive translation of Scala 3 Book to Chinese (Simplified).

Formats: Place one space between Chinese characters and English words or numbers, but no additional spaces between punctuation in fullwidth form and other contents.

Progress:

• [zh-cn] Initialization and Introduction #2272
• [zh-cn] Scala 3 Features #2340