Check if required client library is available

[johscheuer]

What would you like to be added/changed?

Currently we only validate if the correct fdbcli binary is available we should also check if the required FDB client library is available in our operator Pod.

[brownleej]

This could be trickier, because the file name rules for client libraries are technically less strict, and we may only have a certain version's client library available as the primary library.