Bingo DB should not require a lock if opened read-only

I need to access a given bingo nosql db from multiple processes. The db is expected to be read-only after creation.

I'm loading the db file with `bingo.Bingo.loadDatabaseFile(indigo, path, options='read_only:true')`.

Looking at the native code here:

https://github.com/epam/Indigo/blob/6622510d992a1b232b6063998f6799f917c8f32d/api/c/bingo-nosql/src/bingo_base_index.cpp#L148

it appears the lock is requested independent of the options passed to load.