StreamableHTTP Client integration tests

[kpavlov]

Create integration tests for Client with StreamableHTTP transport:

1. Roots

• Capabilities https://modelcontextprotocol.io/specification/draft/client/roots#capabilities
• Listing Roots https://modelcontextprotocol.io/specification/draft/client/roots#listing-roots
  • Bad request
  • Security - Allow
  • Security - Deny
• Root list changes https://modelcontextprotocol.io/specification/draft/client/roots#root-list-changes

2. Sampling

• Capabilities
  • Creating Messages - Text https://modelcontextprotocol.io/specification/draft/client/sampling#creating-messages
  • Creating Messages - Image
  • Creating Messages - Audio

3. Elicitation

• Capabilities
• Creating Elicitation Requests - Text https://modelcontextprotocol.io/specification/draft/client/elicitation#creating-elicitation-requests
• Creating Elicitation Requests - Structured Data https://modelcontextprotocol.io/specification/draft/client/elicitation#structured-data-request
  • Supported Schema Types - String
  • Supported Schema Types - Number
  • Supported Schema Types - Enum
  • Reject Response
  • Cancel Reponse