[Ignore] atbt discerning Insert/Update

[7CMiguel]

#721 Related issue

[ahmad-moussawi]

I would suggest to not introduce a new attribute in this case,
we can use the same Ignore attribute and add optional parameters to select which operation should be ignored.

[Ignore(IgnoreOperation.OnInsert)]
// [Ignore(IgnoreOperation.OnUpdate)]
// [Ignore(IgnoreOperation.Always)] // the default option
public string Name { get; set; }

[ahmad-moussawi]

Nice feature!, I suggested to reuse the existing Ignore attribute, and please add test to cover this change

[7CMiguel]

@ahmad-moussawi also about considerKeys, on Update/Insert, i was thinking that when is true it should be able to put the Where despite this attb being [Ignore], in my case we are using [Key, Ignore] for Ids, bcos they auto generate in db but for keys we want to insert we just avoid the [Ignore], but i need to put myself for the update.Where(keys, keys.value) more than 1 where if needed for complex keys, but if we would leave this outside can be usefull. What d u think.

Instead of
if (property.GetCustomAttribute(typeof(IgnoreAttribute)) != null) { continue; }
First and then
if (considerKeys && colAttr != null) { if ((colAttr as KeyAttribute) != null) { this.Where(name, value); } }
Put the consider keys + Where first and then the continue

[7CMiguel]

@ahmad-moussawi changes aplied + UT to check the ignore on diferent cases.