Add support for cataloging agents

[acherla]

Add an option for cataloging agents to enable the following capabilities

1. Ability to share/copy/re-use agents across teams
2. Ability for agent creator to update an agent and have it automatically apply to multiple team workflows

Future:

1. Ability for agent creator to control access to an agent for other users to leverage (Comprehensive ACL for sharing and providing access to certain agents based on permissions/roles). To be implemented after agent catalog .

Ill take this PR

[StreetLamb]

@acherla Good suggestion, thanks for working on this! In the future, I can also foresee sharing and reusing team within another team