Introduce getBeanProvider variants with allowEagerInit flag

[jhoeller]

Triggered by gh-24644, the unique capabilities of getBeanProvider (which include stream-based access to generic type matches as well as ordered stream access) are useful for many purposes but miss a key ingredient from the simpler ListableBeanFactory retrieval methods: namely the ability to suppress eager initialization for type checks. Introducing dedicated getBeanProvider variants with an allowEagerInit flag at ListableBeanFactory level closes that gap without introducing the concept of eager/lazy type initialization at the basic BeanFactory level (where no other such methods with an allowEagerInit flag exist).

There is also an includeNonSingletons flag on those ListableBeanFactory retrieval methods which we are not mirroring here since it is less useful in general and potentially irritating in terms of semantics for the full set of ObjectProvider retrieval methods.