Support for ENTSOG profile 4.0

[beth-soptim]

ENTSOG has published a new version of their AS4 profile:

https://www.entsog.eu/interoperability-and-data-exchange-nc#as4-documents-for-implementation

https://www.entsog.eu/sites/default/files/2025-01/INT2819_25%20AS4%20Usage%20Profile_Version_4.0%20FINAL%20Public%20Review%20for%20Comments.pdf

phase4 currently supports only version 3.6 (I guess).

[beth-soptim]

related -> #366

[phax]

Here are the official links from the ENTSOG website under the "AS4 – documents for implementation" section:

Main document (Version 4.0 FINAL):

• https://www.entsog.eu/sites/default/files/2025-09/INT2819_25%20AS4%20Usage%20Profile_Version%204.0%20Final.pdf
  (published 05 May 2025)

Comparison document (v3.6 → v4.0):

• https://www.entsog.eu/sites/default/files/2025-08/INT2819_25%20ENTSOG%20AS4%20comparison%20version%203.6%20to%204.0.pdf
  (published 17 Mar 2025)

Landing page (canonical URL for the section):

• https://www.entsog.eu/interoperability-and-data-exchange-nc#as4-documents-for-implementation

A couple of notes:

• There is also a new AS4 FAQs document published June 2025: https://www.entsog.eu/sites/default/files/2025-06/INT2879_25%20ENTSOG%20AS4%20FAQs%202025%20ver%200.2%20FINAL%20PUBLISHED.pdf — which may be useful for implementation reference alongside the profile itself.

[phax]

Will be part of the 4.4.2 release