Describe the bug
The MCP SDK has renamed streamablehttp_client to streamable_http_client in version 2 (mcp>=2.0). This change causes the OpenInference MCP instrumentation to silently fail to instrument Streamable HTTP connections, as the post-import hook is looking for the old module and attribute names.

To Reproduce
Steps to reproduce the behavior:

1. Install an MCP SDK version 2.0 or greater (mcp>=2.0).
2. Run an application using streamable_http_client for MCP connections with OpenInference MCP instrumentation enabled.
3. Observe that Streamable HTTP interactions are not being traced or captured by the observability backend.

Expected behavior
The instrumentation should successfully locate and wrap the streamable_http_client transport provided by the newer MCP SDKs and successfully trace the streamable HTTP connections.

Screenshots
N/A

Desktop (please complete the following information):

• OS: [Your OS, e.g., macOS]
• Version: [Your Version]

Additional context
The fix simply requires updating the string literals referencing streamablehttp_client to streamable_http_client in src/openinference/instrumentation/mcp/__init__.py and the corresponding tests.