Improve edit agent's knowledge of tools (#6356)

# Description of Changes
Give Edit Agent access to descriptions of the request from the Java API.
This opens the door to us better documenting our Java APIs to give the
stirling engine better knowledge of what the various tools are and how
to use them.

Also improves the tool selection sub-agent to get the tool parameters
and descriptions so it can more intelligently decide which operations
should be used to fulfil the user's request. Also provides it more
encouragement to string together multiple operations if necessary.