DET-422: Add support for CSE Rule custom window sizes.

[pwardecki-sumo]

Adds support for CSE Rule Custom Window Sizes.

For each of the Rule Types (Threshold, Chain, Aggregation):

• window_size_millis was added as a new resource field
• structure and read/create/update functions were updated accordingly
• because of conditional nature of the new field test scenarios were extended to:
  • createAndUpdate (the old one)
  • createAndUpdateWithCustomWindowSize
  • createAndUpdateToCustomWindowSize

Screen from apply: