Add support for corporate actions requests

[OlegRa]

The new API endpoint is already available in paper and live trading environments. The Go SDK also has support for it (see #272) as well.

• Implement low-level request/response for obtaining a single page of data with all possible results
• Add paging support into the extensions library for retrieving all pages in an asynchronous manner
• Think about helper methods for reading only one type of corporate action as enumerable