Add logger to context for serverInit

[bwalding]

Makes the gomcp server logger available during server init (via the context) - this has a few advantages:

1. The gomcp logger is now available for logging during the setup of the tool context
2. We only need to do logger setup once in the server init
3. Our logs are properly interleaved in the same log as the MCP server

Logger setup

In our case, the logger setup is configuring the logrus package (https://github.com/sirupsen/logrus) to send logs to the same place as the MCP server.