[Rpm-maint] [rpm-software-management/rpm] Add keyring iterator API for accessing the keys in rpmKeyring (Issue #3337)

[Panu Matilainen]

What be basically want here is three API functions, and an opaque iterator struct: 

- new-function to return an iterator from a keyring, with an unused flags argument for future expansion
- next-function that returns the next key as a weak reference 
- free-function to free up the iterator when done
- the iterator holds a read-only lock on the keyring *for its lifetime*
- the iterator holds a reference to the current key so that callers dont need to mess with it (unless they want to keep a reference) 

So adopting the stuff in the PR a bit, this is what we need:
- rpmKeyringIterator rpmKeyringInitIterator(rpmKeyring keyring, int unused); 
- rpmPubkey rpmKeyringIteratorNext(rpmKeyringIterator iterator);
- rpmKeyringIterator rpmKeyringIteratorFree(rpmKeyringIterator iterator);

Note Init instead of Get - this is commonly used in the codebase, and "int unused" for future expansion. Don't add any speculative filter code now, that only complicates things unnecessarily.

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