SSE client transport doesn't handle complex server URLs

[hiranya911]

Describe the bug
Some MCP servers have complex URLs with query parameters. But the transport always appends an /sse path segment to the URL by default:

kotlin-sdk/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/client/SSEClientTransport.kt

Lines 55 to 59 in 63a50c1

	client.sseSession(
	urlString = "$it/sse",
	reconnectionTime = reconnectionTime,
	block = requestBuilder,
	)

Currently you can workaround this behavior by initializing the transport with an HttpRequestBuilder instead of the URL string. But it would be nice if the transport didn't make any assumptions about the server URL format.