feat: sep-1036 add URL Mode Elicitation (#843)

closes #410 

## How Has This Been Tested?
integration and unit tests 

## Breaking Changes
none

## Types of changes
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed

integration-test/src/jvmTest/kotlin/io/modelcontextprotocol/kotlin/sdk/server/ClientConnectionTest.kt

@@ -9,6 +9,7 @@ import io.modelcontextprotocol.kotlin.sdk.types.CallToolRequestParams
 import io.modelcontextprotocol.kotlin.sdk.types.ClientCapabilities
 import io.modelcontextprotocol.kotlin.sdk.types.ElicitationCompleteNotification
 import io.modelcontextprotocol.kotlin.sdk.types.ElicitationCompleteNotificationParams
+import io.modelcontextprotocol.kotlin.sdk.types.EmptyJsonObject
 import io.modelcontextprotocol.kotlin.sdk.types.GetPromptRequest
 import io.modelcontextprotocol.kotlin.sdk.types.GetPromptRequestParams
 import io.modelcontextprotocol.kotlin.sdk.types.ListRootsRequest
@@ -61,6 +62,7 @@ class ClientConnectionTest : AbstractServerFeaturesTest() {
 
     override fun getClientCapabilities(): ClientCapabilities = ClientCapabilities(
         roots = ClientCapabilities.Roots(listChanged = true),
+        elicitation = ClientCapabilities.Elicitation(url = EmptyJsonObject),
     )
 
     private val sampleRoots = listOf(Root("file:///project", "Project Root"))