need support for reductions of arrays of async tiles

[evaleev]

lazy tiles that can be converted to Future<eval_type> cannot be reduced, need to probe here whether arg is argument_type (or future to it) or it is async-convertible to argument_type.

[evaleev]

this is the underlyng issue of https://github.com/ValeevGroup/mpqc4/issues/508

[evaleev]

63d32015061d597d2363b0e200cc5f09f1821933 confirms that arrays of non-async lazy tiles can be reduced fine