Changed a few methods in FlashLFQ to work with DIA

[zhuoxinshi]

Added an overload GetIndexedPeak method that uses mz instead of neutral mass and charge as input to find a peak from a specific scan Added GetXIC in FlashLfqEngine as a static method to find XIC for a spectral peak

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 79.16667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 77.78%. Comparing base (8cea9fc) to head (a0cae70). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
mzLib/FlashLFQ/PeakIndexingEngine.cs	69.56%	6 Missing and 1 partial :warning:
mzLib/FlashLFQ/FlashLfqEngine.cs	85.71%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #835   +/-   ##
=======================================
  Coverage   77.77%   77.78%           
=======================================
  Files         229      229           
  Lines       34140    34159   +19     
  Branches     3537     3539    +2     
=======================================
+ Hits        26554    26570   +16     
- Misses       6983     6985    +2     
- Partials      603      604    +1     

Files with missing lines	Coverage Δ
mzLib/MassSpectrometry/MsDataScan.cs	86.45% <100.00%> (+0.21%)	:arrow_up:
mzLib/FlashLFQ/FlashLfqEngine.cs	92.28% <85.71%> (-0.19%)	:arrow_down:
mzLib/FlashLFQ/PeakIndexingEngine.cs	90.25% <69.56%> (+0.39%)	:arrow_up:

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