Step 0: Light class object is created, no delegates are computed
Step 1: constructs dummy delegate which can not be relied upon to know signature of any member
It can be used to construct light field and light method objects
(which can correctly respond to some queries) before constructing real delegate
Step 2:
Construct real delegate if dummy delegate is not enough to respond to a query
This speeds up multiple scenarios where getMethods() and getFields() are called on numerous classes
Dummy delegate's faster consruction is achieved by using specially setup dumb analysis instead of ide analysis
Introduce LazyLightClassDataHolder: which manages creation of Step 1 and Step 2 delegates
Introduce MemberIndex: keeping track of member creation order, helps matching light class delegates created in different contexts
KtLightMethod and Field: make use of dummy delegate
KtLightMethod no longer extends LightMethod since it requires eager delegate construction
KtLightMethod now implements PsiAnnotationMethod for convenience (ClsMethodImpl implements PsiAnnotationMethod)
