packages: Core procedures are written in monadic style.

This plays better with the functional object cache, which is no longer
lost across calls to procedures created by 'store-lift'.

* guix/packages.scm (input-graft, input-cross-graft): Remove 'store'
parameter.  Return a monadic procedure.
(bag-grafts): Remove 'store' parameter and turn into a monadic
procedure.
(graft-derivation*): New procedure.
(cached): Remove clause to match syntax without (=> CACHE).
(package-grafts): Define using 'store-lower'.
(package-grafts*): New procedure, from former 'package-grafts'.  Remove
'store' parameter and turn into a monadic procedure.
(package->derivation): Rewrite using 'mcached' and a monadic variant of
the former 'package-derivation' procedure.
(package->cross-derivation): Likewise.
(package-derivation, package-cross-derivation): Rewrite in terms of
'store-lower'.
(%graft-cache): Remove.

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