hoprdv3 session improvements

[esterlus]

• allow loopback target in sesison creation dialogue
• include new session capabilities: /scalar#tag/session/post/api/v4/session/{protocol}.body.capabilities
• suggest NoDelay for UDP sessions on creation
• allow changing a session configuration after it was created: /scalar#tag/session/post/api/v4/session/config/{id}
• expose the new attributes during session creation - see /scalar#model/sessionconfig

namely: "maxClientSessions", "maxSurbUpstream", "responseBuffer", "sessionPool"`

[mjadach-iv]

OPEN session -> CREATE session listener

[mjadach-iv]

Session id is listed in the Active array