PropertyBuilder can have custom ValueComparer

[halllo]

I have a DbContext with a conversion like this:

public void Configure(EntityTypeBuilder<CachedGroup> builder)
{
	builder.Property(e => e.Roles).HasConversion(
		x => JsonConvert.SerializeObject(x, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore }),
		x => JsonConvert.DeserializeObject<IList<string>>(x, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore }));
}

When the DbContext gets created, it logs the following warning:

The property '"Roles"' on entity type '"CachedUser"' is a collection or enumeration type with a value converter but with no value comparer. Set a value comparer to ensure the collection/enumeration elements are compared correctly.

Apparently there is no ValueComparer associated with this property. Only InternalPropertyBuilder allowed setting custom ValueCompareres. I though it was a good idea to allow custom ValueComparers to get rid of the mentioned warning. What do you think?

[dnfclas]

All CLA requirements met.

[ajcvickers]

Duplicate of #18643. See #17471 (comment) for how to do it before this is implemented.