fix: Remove @SerialName annotation for inputSchema (modelcontextprotocol#105)

* Remove unused @SerialName annotation for inputSchema

* update test

Author: adamglin0

src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.kt

@@ -5,7 +5,6 @@ package io.modelcontextprotocol.kotlin.sdk
 import io.modelcontextprotocol.kotlin.sdk.shared.McpJson
 import kotlinx.serialization.EncodeDefault
 import kotlinx.serialization.ExperimentalSerializationApi
-import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.JsonObject
@@ -1046,7 +1045,6 @@ public data class Tool(
     /**
      * A JSON object defining the expected parameters for the tool.
      */
-    @SerialName("input_schema")
     val inputSchema: Input,
 ) {
     @Serializable

src/commonTest/kotlin/ToolSerializationTest.kt

@@ -17,7 +17,7 @@ class ToolSerializationTest {
         {
           "name": "get_weather",
           "description": "Get the current weather in a given location",
-          "input_schema": {
+          "inputSchema": {
             "type": "object",
             "properties": {
               "location": {