Implement `TryInto` for `NodeName` and `ServiceName`

[elfenpiff]

(Code) Example Of Cumbersome API

Instead of writing:

NodeBuilder::new().name(&NodeName::new("whatever")?);

we could write

NodeBuilder::new().name("whatever".try_into()?);

which is much cleaner.

Improvement Suggestion

Implement TryInto for NodeName and ServiceName