[Tarantool-patches] [PATCH 1.10 v3 4/4] module api: add luaL_iscallable with support of cdata metatype

[Alexander Turenko]

> module api: add luaL_iscallable with support of cdata metatype

Try to fit to 50 symbols.

>
> From: Alexander Turenko <alexander.turenko at tarantool.org>
> 
> Part of #5273.

Don't forget about -x for `git cherry-pick` for backports (to add
'cherry picked from <commit>').