FlashLFQ refactoring to enable generic peak operations

[Alexander-Sol]

Added an interface, ISingleScanDatum and and abstract class, TraceablePeak, to enable the generic use of pre-existing FlashLFQ functions.

ISingleScanDatum

• Defines the behaviour that a single datapoint is expected to have, e.g., mz, index, separation (retention time)
• Examples are IndexedMassSpectralPeak, IsotopicEnvelope

TraceablePeak

• Contains a list of ISingleScanDatum object
• Implements a default CutPeak method
• Provides a static FindPeakBoundaries method that should be useful