box: export more symbols

box_info_lsn
box_is_ro
box_ro_reason
box_wait_ro

Closes #10378

NO_CHANGELOG=minor change

@TarantoolBot document
Title: document 4 more symbols in public C API

box_info_lsn
box_is_ro
box_ro_reason
box_wait_ro

Their meaning is identical to lua methods:

box.info.lsn
box.info.ro
box.info.ro_reason
box.wait_ro

(cherry picked from commit f1c76b976077e8078c42990546d9dbbdea315425)