Update SA1504 to handle expression-bodied accessors

[sharwell]

I left out this update during the work on #2395. Currently expression-bodied accessors are treated the same way as auto-properties (both have a SemicolonToken), which means no diagnostics are ever reported. There are many edge cases to implement and test related to mixing and matching expression-bodied and full accessor syntax, where each can be either single- or multi-line.

[nicolaslattuada]

Hello @sharwell !
I am trying to understand why SA1201, does not trigger in case of expression-bodied members.
Will your enhancement also support this?

Thanks !