[gNB] E1AP: BC BEARER CONTEXT SETUP FAILURE

[Borjis131]

Following 3GPP TS 37.483 - Release 17.8.0

Add E1AP IEs:

• 9.3.1.1 - Message Type
• 9.3.1.106 - gNB-CU-CP MBS E1AP ID
• 9.3.1.107 - gNB-CU-UP MBS E1AP ID
• 9.3.1.2 - Cause
• 9.3.1.3 - Criticality Diagnostics

9.2.5.1.1 E1AP BC BEARER CONTEXT SETUP REQUEST:

• Message Type (M, criticality, reject)
• gNB-CU-CP MBS E1AP ID (M, criticality, reject)
• gNB-CU-UP MBS E1AP ID (O, criticality, ignore)
• Cause (M, criticality, ignore)
• Criticality Diagnostics (O, criticality, ignore)