* Adds Overload to AddIndexOption
Simplify usage. We don't need to create/add the underlying explicitly, see AddIndexOption(string, Resolution, string, bool) overload.
* Addresses Peer-Review
- Default market is `null` instead of `Market.USA` allowing for `BrokerageModel` setup.
- `AddIndexOption` and `AddIndexOptionContract` methods now return `indexOption` objects.
* Fixes Logic Bug
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* Expand Index option support
- Adjust APIs so that the same underlying can be used
for different options, adding support for SPX weekly options. Adding
regression tests
* Fix IndexOption.IsStandard
* Add IndexOption test