Add a new index defaults for cloud

[pandu-k]

• Logic for understanding if cloud is being used can be based on if an API key is present
• Make a default index have 2 shards

[pandu-k]

Conflicting defaults problem

• The first solution that comes to mind is to use a settings dict param, but set it to a special "cloud defaults" dict.
• The problem with this is that that, under the current implementation, it would override any index create parameters.
• The better solution is to set up the cloud defaults, then reintroduce arguments (inc. default args) from the create method into the cloud default settings dict.

Implementation

1. have a defaults.py file
2. create a dict "cloud defaults"
3. Create a check for API key in the create() method.
4. Add a "merge defaults" loop that merges args into the cloud defaults dict.
5. Comment where the cloud defaults will be overridden by the method's default params.

We decide that, for now, the cloud defaults will be overridden by the create method's default params. The reason for this is that none of the method's default params conflict with index defaults dict.

[pandu-k]

Resolved by https://github.com/marqo-ai/py-marqo/pull/42