[Feature] Implement TravelAgent for multi-tool travel planning

[itsthemoon]

Description: The goal is to create a new TravelAgent that assists users with travel planning tasks by calling and integrating the results from multiple search tools. This will expand the capabilities of AIOS to handle complex travel-related queries. Inspirations for the design of this agent are: MathAgent, RecAgent, and NarrativeAgent.

Key Features:

• TravelAgent will support travel-related queries by calling relevant tools such as:
  • Hotel search
    • We will use the existing search_hotel.py tool or tripadvisor tool; need more investigation into which to use
  • Flight search
    • We will use the existing tripadvisor flights tool
  • Restaurant recommendation
    • We will use the existing tripadvisor restaurant tool
  • General Information
    • CurrencyConverter tool (if needed)
    • Wikipedia for information about the location we are traveling to
• The TravelAgent will interpret the user's travel intent, call the appropriate sequence of tools, integrate the results, and present the user with comprehensive travel plan options

Implementation Plan

• [x] Create the TravelAgent config
• [x] Add the TravelAgent to the native_agents folder with features impemented
• [x] Add the TravelAgent to the existing agent table in agent_factory.py
• [x] Complete implementation by incorporating the agent into AIOS

Current Limitations/Future Work In this current implementation plan, there are a couple of things that are not included, but would be a great additions.

1. Include recommended attractions in the travel plan
2. Include the weather forecast for the proposed date of travel