Remove obsolete serialization

[alex-kulakov]

Destroyed binary serialization usage - no type implements ISerializable nor IDeserializationCallback, all the types which are not supposed to be serialized lost their [Serializable] attribute.

In particular, Persistent types (Entity, EntitySet<T>, Structure) no longer serializable via obsolete binary serialization. Current recommended approach in dotnet is to create DTOs to manage what exactly serialized and how deep serialization should be, which prevents accidental fetching of the whole graph of data from database.

SerializableExpressions API was moved out main library to extension Xtensive.Orm.SerializableExpressions. They remain being able to be serialized and support JsonSerializer and DataContract serialization.

Operations API was moved out main library to extension Xtensive.Orm.Operations, except for abstractions needed to exist inside main library, so this improved speed o entity operations in main scenario when no operation registered. Operations can be serialized by JsonSerializer, also added JsonConverters and an extension to add them to JsonSerializerOptions.Converters collections.

Removes serialization tests or parts of tests that performed such

Other changes that appeared during main task

• TupleUpdater is obsolete] because it is not in use so will be removed.
• IntegrityException is obsolete
• ReferenceInfo, SyncAction structs became readonly, properties replaced with readonly fields
• ColumnInfoRef properties replaced with readonly fields
• PrefetchProcessor removed
• Improve domain model validation speed by just adding exceptions to ExceptionAggregator, instead of using throwing of them
• Added AdvancedConveters for types like DateOnly, TimeOnly, DateTimeOffset and byte[] to other types and from other types, adding conversion to string fixed TupleFormatExtensions.Format(this Tuple) and TupleFormatExtensions.Parse(this TupleDescriptor, string) extension methods, which could not work for some of real-life tuples from actual entities. Tests for conversions and tuple operations added. This was required for tuple serialization.
• AdvancedConverters tests improved, now most of them have unified structure with superset of tests, one for each possible target type; possible target types for converter declared in each test class; if conversion is impossible test is ignored.
• applied formatting rules and/or resolved some of ide warnings