AutoSecurityScheme required for OPCUA binding

[erossignon]

Wot specifies:

4.1.2 AutoSecurityScheme
IRI: https://www.w3.org/2019/wot/security#AutoSecurityScheme
An automatic authentication security configuration identified by the term auto (i.e., "scheme": "auto"). This scheme indicates that the security parameters are going to be negotiated by the underlying protocols at runtime, subject to the respective specifications for the protocol (e.g. [RFC8288] for Basic Authentication when using HTTP).

OPC Wot Binding RC specifies:

Therefore we need to implement the generic AutoSecurityScheme in core, so it can be used in binding-opcua.

[danielpeintner]

Resolved by #1425