Move the time-axis to its own library

The time-axis used is part of the [timeline-chart](https://github.com/theia-ide/timeline-chart) library. It should be moved in a separate library so that it can be reused (eg for XY charts) and updated separately. The time-axis is the basis for navigation: zoom in/out, show the current time range.

- [ ] There is a unit controller "TimeGraphUnitController in the timeline-chart library that control the "time" and a "TimeAxisComponent" that use the unit controller to draw the axis
- [ ] Maybe everything can stay in the timeline-chart library or can be split into different components that can be added as dependencies
- [ ] The time-axis also has a visual representation. Be creative ;-) Lttng-scope had an interesting approach

Start by inspecting the TimeGraphUnitController and TimeAxisComponent in the timeline-chart library, then compare the Lttng-scope approach mentioned in the issue. Determine which time-axis and navigation pieces should become reusable library dependencies, and define the library boundary and visual behavior before implementation.

Written by the indexing model from the issue text.