Daffodil debugger server to use domain sockets and named FIFOs

[scholarsmate]

Firewalls and other TCP services on the same ports have been and will continue to cause problems for users. If possible, add support for domain sockets and named FIFOs in a way that will be cross-platform.

[scholarsmate]

It appears that the debugger server already has support for domain sockets and named pipes (see: https://github.com/apache/daffodil-vscode/blob/main/src/adapter/extension.ts#L43). We need to verify that it works and document it. Also I think it's worth making it the default way that we connect to the server if it works.

[arosien]

I wonder if a different interface should be used: I believe 0.0.0.0 is used by default, but 127.0.0.1 might be less restricted by the OS?

In any case, we could allow finer-grained hostname/interface control in the config to test this.

[arosien]

Do folks actually have issues now that localhost is used by default (vs. 0.0.0.0)? cc: @scholarsmate @mbeckerle @stevedlawrence