Unbind the ability of rpc direct connection and the package of mosn

[wenxuwan]

What would you like to be added:

#739 make direct connection in mosn chan, can unbind the feature and the package of mosn

Why is this needed:

In the future, layotto may no longer rely heavily on the MOSN project

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue or help wanted) or other activity occurs. Thank you for your contributions.

[github-actions]

This issue has been automatically closed because it has not had activity in the last 37 days. If this issue is still valid, please ping a maintainer and ask them to label it as pinned, good first issue or help wanted. Thank you for your contributions.