implements an fb_exec_requests system table. The purpose of this table is to allow access to internal state to see what queries are running and have been run.
Co-authored-by: Travis Turner <travis@molecula.com>
(cherry picked from commit 47d8be26f5)
* implement system tables that contain internal state information from FeatureBase
* review feedback
* review feedback
* removed sys prefixes
(cherry picked from commit 45067b4e32)