Add a view for retrieving updates to the review request page.
Review Request #852 — Created Sept. 5, 2017 and updated
This introduces a new internally-facing view that provides information on the updates made to existing entries on the page (along with certain UI elements, such as the issue summary table). The client will be able to poll for this information and dynamically update the page without a reload. Each update contains JSON metadata consisting of basic information on that entry/UI element, model attributes, and view options. The update also contains new HTML for that part of the page. Rather than using JSON or some other standard serialization format to represent all the resulting changes on the page, the payload instead uses a custom format that serializes updates as: 1. The byte length of the JSON metadata 2. The JSON metadata contents 3. The byte length of the HTML content 4. The HTML content This is more compact than using a format like JSON, as the HTML can be represented as-is and doesn't need to be escaped when serializing. It's faster, as the JSON can be quickly parsed and the HTML directly set in the DOM. It's also a streamable format, allowing us down the road to push updates directly to the page piece-by-piece. The view allows for filtering by specific entries or entry types, and also allows for filtering by timestamp. The entries have been extended to support ETag generation, allowing for flexible caching of results. An upcoming change will make use of this client-side. Testing Done: Unit tests pass. Tested the filtering options manually with a series of different entries. Tested the updates capabilities with the upcoming client-side change. Reviewed at https://reviews.reviewboard.org/r/9133/
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