Implementation of TRestEventTimeSelectionProcess to select events by their timeStamp (#540)

* Implementation of process to select events by their timeStamp

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* implement start and end time margins

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* fix typo

* refactor event time selection logic for clarity

* improve documentation

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* validate time format in event time selection process

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* improve GetTimeStampCut method

* enhance PrintMetadata output with total time fraction

* add ReadFileWithTimes method to streamline time range file processing

* add specific methods to set active and dead time states

* add margin time parameters to documentation

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* improve the example in the doc

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