With #8906 the object types mentioned above were introduced. They control
access to code execution over IPROTO.
This patch adds such object types support to credentials applier. Now
'execute' can be granted to a user or role for 'lua_eval', 'lua_call' and
'sql'. Note that similar to 'universe', objects can't be specified in
the config, only 'all' is allowed.

Part of #8967

NO_DOC=documentation request will be filed manually for the whole
       credentials