Paginated download of data for Clinical Data tab in Study View

[pvannierop]

⚠️ This PR breaks the API. Should be merged together with the corresponding cbioportal PR

Background

• At present all clinical data is downloaded the the user visits the Clinical Data tab on Study View. On large studies this results in a very long wait period before the user can interact with the data table.

Solution

• This PR will implement paginated download of clinical table. A slice of 1000 sample records is retrieved which can be paginated locally.
• Clinical Data is collected in the SampleClinicalDataCollection class where the data is keyed by the uniqueSampleKey (base64 encoded concatenation of sample and study identifier).

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