ServiceBus - Track2 - Normalize management argument naming with other languages

[KieranBrantnerMagee]

Two components:

1. [Discussion] Service Bus - Track 2 - Management client model changes azure-sdk-for-net#13352

• Input to Create* is Create*Options
• Rename *Description -> *Properties (none of the properties are optional)
• Rename *RuntimeInfo -> *RuntimeProperties

2. [Discussion] Service Bus - Track 2 - Management client - RuntimeProperties flattening azure-sdk-for-net#13353

• Flatten MessageCountDetails
• Rename MessageCount -> TotalMessageCount
• Size property should be in bytes

Appendix:

• evaluate if any properties from within runtime vs. description should shuffle (originally for this issue)