Support A2A Protocol

[handicraftsman]

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Google has introduced a protocol for user-to-agent and agent-to-agent communication, https://a2aprotocol.ai/

Using this protocol it is possible to create agents that bundle with their own tools, like agents you can create with Rovo (https://www.atlassian.com/software/rovo), but accessible in a standardized way, both programmatically and manually.

As a note: it might be feasible to allow having path variables in paths to agent cards, so that multiple different agents can be hosted in the same Spring app.
Potentially, this note applies to MCP servers as well, but that's a different issue.