Broken graphql.NoCache implementation

[adomaskizogian]

graphql.NoCache[T,T2] struct implements graphql.Cache[T] interface but it is not assignable to any of the internally used fields. For example it is not possible to assign NoCache as apq cache. There's no way to instantiate NoCache with value type values. Only with pointer values.

Specifying key type on graphql.NoCache[T,T2], // NoCache[T any, T2 *T] forces the value of cache to be a pointer of key type. For example:
graphql.NoCache[string, *string].

A code snippet like bellow is not possible:

var cache graphql.Cache[string]
if config.UseAPQ {
  cache = &graphql.MapCache[string]{}
} else {
  cache = &graphql.NoCache[string]{}
}

Internally all caches use string type keys.

Type definitions were changed with #3179

[adomaskizogian]

cc @sylr