Camera and pointing calibration API

[TjarkMiener]

This issue summarizes the suggestion for camera and pointing calibration API discussed in the ctapipe-dev call (5.4.2024) and aims to divide the implementation of the camera and pointing calibration API into sub-tasks, which will be addressed in dedicated PRs.

• Processing (non-gainselected) calibration data using the process-tool. Change R1- and DL0-waveforms shape to (n_channels, n_pixels, n_samples) #2529 by @Hckjs
• Add an image extractor for the variance of the waveforms. Variance extractor #2543 @ctoennis
• Add API for the statistical calculation of pixel-wise values over a given time interval (mean, median, variance, std …), i.e. StatisticsAggregator. Different aggregators can be based on numpy/scipy; astropy sigma clipping Add StatisticsAggregator API #2554 @TjarkMiener
• Add OutlierDetector components OutlierDetector components #2604 @TjarkMiener
• Adjust StatisticsAggregator for star tracking purposes @ctoennis
• Add API for the CalibrationCalculator, which holds different subcomponents for the calculation of camera coefficients, e.g. FFactor method. Add calibration calculators #2609 @TjarkMiener
• Add a pointing correction component using star tracking @ctoennis
• Implementation of orchestrating tools and workflows (telescope specific tools and routines in calibpipe directly; generic tools in ctapipe) Stats calc tool #2628 @TjarkMiener @ctoennis

Related issues: #1041 #1147 #1836 #1037 #2439

Please comment in case something is missing or we should follow a different path forward @Hckjs @FrancaCassol @mexanick. Discussion on specific sub-tasks can be moved to a dedicated issue.