Add support for Match (Fixes #6)

[sio2boss]

Initial draft of adding Match support with major help from Cursor / Claude. I'm particularly interested in getting a security review as there was a comment about that. So this is now supported:

Match Host *.example.com
  Compression yes
  HostName test.example.com
  Port 2222
  User hi_there

[dnitsch]

I wonder if it might make sense to have a less strict Decode mode as only introducing a partial support for the Match might be misleading?

Perhaps also adding a noStrict property on the Config struct allowing for parsing of the entire config file and not failing - including the Host property for Match.

I know this would help me a lot :D