Improve performance of HillasReconstructor

[maxnoe]

Please describe the use case that requires this feature.

HillasReconstructor is dominating the runtime of processing simtel files up to DL2 training. A cursory glance at the code lets me think there is a lot of room for easy improvement.

Describe the solution you'd like

Refactor HillasReconstructor code to optimize performance.

[kosack]

most of the time is taken in the coordinate transforms and creating coordinates. It's likely that could be optimized

[maxnoe]

Most of this was done in #2036