Adding MCP call (via HTTP and STDIO)

[amin-nikanjam]

Please specify parts of this PR update:

• Specification
• Schema
• Examples
• Extensions
• Use Cases
• Community
• CTK
• Other

Discussion or Issue link:
#1101

What this PR does:
This PR adds MCP call task (via both HTTP and STDIO) to the specification and schema.

Additional information:
The call tries to establish a connection to a MCP server specified either by a URI (for HTTP) or a filename (for STDIO). For the initialize method, the MCP protocol version must be specified, so we suggest runtimes to implement the MCP specification version of 2025-06-18.

[ricardozanini]

@amin-nikanjam can you take a look on CI and sign your commit?

[amin-nikanjam]

@amin-nikanjam can you take a look on CI and sign your commit?

done.

[ricardozanini]

Can you dd examples to run on CI and fix the current one? I think your changes in the schema broke something.

[amin-nikanjam]

Can you dd examples to run on CI and fix the current one? I think your changes in the schema broke something.

I added the examples, and tried to run a workflow. I think the CI can't find the "MCP" as a call type.

[yzhao244]

@amin-nikanjam Hi Amin, when you got a chance, could you please also update the following information as part of the PR description. MCP support is going to be another big one to the spec lol, its important for documenting them in the PR for tracking purpose. :)

Discussion or Issue link:

What this PR does:

Additional information:

[ricardozanini]

@amin-nikanjam are you able to fix the CI error?

[amin-nikanjam]

@amin-nikanjam are you able to fix the CI error?

I pushed some potential fixes, I hope they work.