Add support for max_tool_count and max iterations from yaml

[vizsatiz]

• Currently the agent will stop looping when it reaches max_tool_count, and break the flow. Right now the max loop count is exposed in constructor of Agent Class, but its not configurable from YAML.
• Similarly the execution will break when arium reaches max_iterations, this is hardcoded to 20 as of now. This should be exposed over arium interface & also in YAML