Add timeout and retry options for connect()

[ctonneslan]

Add configurable timeout and automatic retry logic to connect().

Currently if a server is slow to respond or temporarily unavailable, the connection just fails. We should support:

const server = await connect("http://localhost:3000/mcp", {
  timeout: 10000,     // 10 second timeout
  retries: 3,         // retry up to 3 times
  retryDelay: 1000,   // 1 second between retries
});

Implementation notes:

• Wrap the transport connection in a timeout using AbortController
• On failure, retry with exponential backoff up to retries times
• Throw a clear error message after all retries are exhausted