thunk: introduce public variant of THUNK_DEFINE

This is necessarily split in two:

THUNK_DEFINE()
THUNK_DECLARE()

use is identical to the original THUNK_DEFINE (now THUNK_DEFINE_STATIC),
and you supply the same input to both DEFINE and DECLARE.

The THUNK_DECLARE() should go in the public header, which you also
include in the implementing .c file, not just from consumers.

The THUNK_DEFINE() goes in the implementing .c file, same as before.

Use this variant when you wish to instantiate via THUNK() from external
listings, just include the THUNK_DECLARE()-containing .h.

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