Refactor sdb_foreach and related APIs

[pelijah]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

• sdb_dump_dupnext() was replaced with sdb_dump_next() which returns pointers to mmaped/buffered file (sdb_const_get() already does the same thing)
• sdb_dump_next() reads KV until start of hashes table is reached
• sdb_foreach() now passes key/value lengthes SdbKv to a callback
• sdb_foreach_list*() APIs were replaced with sdb_get_kv_list*() which return RzList sdb_get_items*() which return RzPVector instead of SdbList (it is the first step of getting rid of SdbList)

Test plan

...

Closing issues

...

[XVilka]

LGTM but needs minor renaming