Feat: non-ref-struct collection builder

[YuHima03]

Summary

The CollectionBuilder<T> cannot be used in some situations such as in async methods because it is ref-structure.
So I want non-ref-structure version of the CollectionBuilder<T>.

Proposal

• Implement non-ref-struct collection builder.

  namespace Yuh.Collections;
  public struct NonRefCollectionBuilder<T> {}