List defined list container, it must have `Items` attr.

PKeyComplexId sets Id as key field, also adds mapping for pkeySchema with namespace from mapping schema.

PKeyConst use constant as state entry key.

PKeyId use Id attr as source for mapped state entry key.

PKeySchema registers all fields from pkeySchema as part of primary key also register keyer for pkeySchema with with namespace from current schema.

StateNamespace sets namespace for mapping.

KeyRefNamespace namespace for uniq indexes.

ErrEntryTypeNotSupported entry type has no appropriate mapper type.

ErrEventMappingNotFound occurs when mapping for event is not defined.

ErrFieldTypeNotSupportedForKeyExtraction key cannot extracted from field.

ErrStateMappingNotFound occurs when mapping for state entry is not defined.

KeyRefIDKeyer keyer for KeyRef entity.