Add additional estimation examples

[DominicDirkx]

To better make the estimation functionality visible, and identify shortcomings/improvements in the interfaces, additional example applications are to be created. Ideas for example applications will be provided and prioritized in this issue

[DominicDirkx]

A few ideas for modifications (to be discussed; open to suggestions/modifications, ones in bold have priority):

• The current (lone) estimation example should only be a covariance analysis, but is now also a 'full' estimation. Since the two functionalities are now properly split, the example can be updated to be only a covariance analysis. This example should include (at the end) a propagation in time of the covariance propagation (which also needs to be added to the documentation)
• An additional example where the full estimation is done should be added separately (possibly with the same mission scenario, to create a series of examples similar to the asteroid orbit optimization examples here: https://docs.tudat.space/en/latest/_src_getting_started/examples.html).
• As part of the above example, or a new example, a case where the dynamical and/or observation models between the simulation of observations and the estimation is different
• An example with a multi-satellite and multi-data type setup (e.g. satellites orbiting an asteroid, with Earth tracking, inter-satellite links, and landmark tracking)
• An example using a 'simple' real data source (TLEs; high-accuracy orbits of satellites, etc.)
• An example using multi-arc state estimation (as is typical for real mission data analysis)
• An example using hybrid-arc state estimation, for dyamics of a spacecraft (multi-arc) and a natural body

We should try to showcase the various pieces of functionality we have in the example applications, and come up with some cool specific applications (Delfi?, JUICE, other planetary missions?)