Test cases for TypeDBOptions

[alexjpwalker]

Problem to Solve

Since moving to a reliance on BDD, TypeDBOptions are largely untested in 2.0.

Current Workaround

Manual testing / integration testing

Proposed Solution

Create BDD scenarios and implement them in all clients

Additional information

Some options are only relevant to queries over RPC (eg batch size) so it doesn't really make sense to include test runners for these options in the Grakn server itself.

Also, some options were tested in client-python in 1.8, and these test scenarios can be salvaged from test_grakn.py in the client-python repo.

[flyingsilverfin]

Note: we have implemented a basic test for options in #364