Support Map type in KV table

[platinumhamburg]

Search before asking

• I searched in the issues and found nothing similar.

Motivation

Add Map type support for KV table scenarios to enable primary key tables with map columns.

Solution

• Extend KV table storage format to support Map type
• Implement Map type serialization/deserialization for KV tables
• Add support for Map type in KV table read/write operations

Anything else?

No response

Willingness to contribute

• I'm willing to submit a PR!

[Jackeyzhe]

Hi @platinumhamburg is there anyone work on this issue? If not, I'd like to take on it.

[XuQianJin-Stars]

#2190 This pull request has already implemented this logic.