* Scaffold `log_entries/entries` route

* Scaffold a log entry response

* Add `after` pagination

* Add `before` pagination

* Process `query` parameter

* Use pre-existing structure for the columns

* Change type of date ranges

We will move the responsibility to parse the dates to the client. The
API will only take timestamps

* Add `center` parameter

Allows consumers of the API to get log items around a certain cursor

* Change default page size

* Test the defaults of the API

* Add optional `size` parameter

This makes easier to test the pagination. By default it returns a 200
size page.

* Test the pagination

* Test centering around a point

* Handle `0` sizes

Co-Authored-By: Zacqary Adam Xeper <Zacqary@users.noreply.github.com>

* Add highlights endpoint

* Refactor `processCursor`

* Tweak cursor handling in the routes

* Refine `LogEntry` type

* Add tests for highlights endpoint

* Tweak the types for the LogEntry

Co-authored-by: Zacqary Adam Xeper <Zacqary@users.noreply.github.com>

ES behaves differently in master and in 7.x, causing the test to fail in
the latter.