LightKurve API

[NWelde]

Adds API endpoint for light curve summary calculation

This pull request introduces a new API endpoint /lightcurve/summary that accepts a TIC ID in the request body and returns a JSON response containing summary statistics of the light curve.

Features:

Calculates mean, median, standard deviation, peak-to-peak, and interquartile range of the light curve flux.
Handles potential errors like missing TIC ID, invalid format, or no light curve found.
Returns informative error messages for debugging purposes.
Testing:

Manual testing with valid TIC IDs has been performed.

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