Add cluster options to DatabaseApiClient

[DiscoPYF]

From "What's new in ArangoDB 3.6":

"The database creation API now provides the replicationFactor , writeConcern and sharding
attributes. All these attributes are optional, and only meaningful in a cluster.
The values provided for the attributes replicationFactor and writeConcern will be used as
default values when creating collections in that database, allowing to omit these attributes when
creating collections. However, the values set here are just defaults for new collections in the
database. The values can still be adjusted per collection when creating new collections in that
database via the web UI, the arangosh or drivers.

In an Enterprise Edition cluster, the sharding attribute can be given a value of "single", which will
make all new collections in that database use the same shard distribution and use one shard by
default. This can still be overridden by setting the values of distributeShardsLike when
creating new collections in that database via the web UI, the arangosh or drivers."

https://www.arangodb.com/docs/stable/http/database-database-management.html#create-database