api: pass configured timeouts to plugins.

[klihub]

Pass configured registration and request timeouts to plugins in the Configure request.

[klihub]

/cc @zhaodiaoer

[klihub]

/cc @kad

[zhaodiaoer]

/cc @zhaodiaoer

LGTM

This is exactly what we need. The plugin owner can use these configurations more conveniently to adjust the context of the internal logic. Thanks.

[klihub]

@fuweid PTAL