NAT A2A Client & Server Support

[AnuradhaKaruppiah]

Description

1. Create a2a subpackage with support for a2a client and servers. This is base support which models the remote-agent as a tool.
2. Add examples for e2e testing
3. Add CLI commands for trouble shooting

Sever CLI

1. Start server using the NAT a2a frontend:

 nat a2a serve --config_file examples/getting_started/simple_calculator/configs/config.yml

Client CLI:

1. agent card discovery

nat a2a client discover --url http://localhost:10000

2. high level agent call

nat a2a client call --url http://localhost:10000 --message "Is the product of 2 and 4 greater than the hour of the day"

Query: Is the product of 2 and 4 greater than the hour of the day

No, the product of 2 and 4 is less than the hour of the day.

Pending items:

1. Data part
2. File Part
3. Auth
4. Telemetry

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  • Any contribution which contains commits that are not Signed-Off will not be accepted.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

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