0.8.0

• Update to latest nuget packages
• Update from .NET Core 3 to .NET 6 (libs are still .NET Standard 2.x)
• Drop Postgres Storage module - The module used NOTIFY/LISTEN but we never managed to pass all the concurrency tests
• Drop SqlStreamStore module - We are building a new RDBMS storage module tailored to perform well with memstate. In the meantime, the Memstate.SqlStreamStore 0.7.x nuget package should work fine.
• Drop the pravega storage module - not enough demand to warrant maintenance effort