Feature: proto file extension

[benjaminhxh]

Checklist

• I've searched for similar issues and couldn't find anything matching
• I've discussed this feature request in the OpenIMSDK Slack and got positive feedback

Is this feature request related to a problem?

None

Problem Description

proto file add extension field

Solution Description

Maybe all proto files should add an extension field

Benefits

some other requirements can also be applied

Potential Drawbacks

No response

Additional Information

No response

[cubxxw]

@FGadvancer What do you think?