Add overloads of UsingEntity() that could take a shared-type entity type

[lajones]

No description provided.

[smitpatel]

Part of #9914

[smitpatel]

• Remove exception throwing for STET when used during UsingEntity with clrType only.

[AndriySvyryd]

To clarify, the only required overloads are:

EntityTypeBuilder UsingEntity(
    [NotNull] name,
    [NotNull] Func<EntityTypeBuilder, ReferenceCollectionBuilder> configureRight,
    [NotNull] Func<EntityTypeBuilder, ReferenceCollectionBuilder> configureLeft);

EntityTypeBuilder<TLeftEntity> UsingEntity(
    [NotNull] name,
    [NotNull] Func<EntityTypeBuilder, ReferenceCollectionBuilder> configureRight,
    [NotNull] Func<EntityTypeBuilder, ReferenceCollectionBuilder> configureLeft,
    [NotNull] Action<EntityTypeBuilder> configureAssociation);

If the specified name doesn't match any existing entity type then we'll assume the CLR type to be Dictionary<string, object> and create a new entity type

Other overloads will be implemented in #21535

[smitpatel]

@AndriySvyryd - #21552 adds overloads of UsingEntity which takes only name when generic and takes name & type when non-generic, just like any other place configuring relationship with STET.

Above overloads are non-generic and does not take type either (which you mentioned that we will assume Dictionary<string, object>. Do you want me to add them too?

[AndriySvyryd]

The reason I chose these is that I don't expect other types to be used for STETs frequently. But these can be added later, along with #21535

[smitpatel]

#21552 fixed this