Add classes for user-defined selected precursor lists to support MRM data workflows

[Alexander-Sol]

Summary
This PR introduces three new classes—SelectedPrecursors, SelectedPrecursorWindow, and SelectedPrecursorForDataGrid—that enable users to manually create and manage a list of selected precursors for use in MRM (Multiple Reaction Monitoring) data analysis.

Key Changes

• SelectedPrecursors

  • Stores the complete set of user-defined precursors.
  • Supports adding, editing, and removing precursors.
  • Designed to integrate with downstream precursor selection logic in the search workflow.

• SelectedPrecursorWindow

  • GUI component for building and managing the selected precursor list.
  • Allows manual entry of precursor m/z, charge state, and retention time bounds.
  • Supports inline validation to prevent invalid precursor entries.
  • Integrates with SelectedPrecursors for persistent storage within a search task.

• SelectedPrecursorForDataGrid

  • Model class tailored for binding to WPF DataGrid controls.
  • Provides property change notifications for UI updates.
  • Encapsulates per-row precursor information with editable fields.

Motivation
MRM data workflows often rely on a predefined set of targeted precursors. Previously, MetaMorpheus had no built-in way for users to manually supply and manage such lists. These new classes:

• Allow users to enter selected precursor information directly into the UI.
• Provide an easy-to-edit, spreadsheet-like interface for managing targeted lists.
• Ensure that the manual list integrates seamlessly into MRM precursor selection during GetMs2Scans.

Next Steps

• Integrate the manual selected precursor list into MRM-specific filtering and search workflows.

[codecov]

Codecov Report

❌ Patch coverage is 99.41176% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.63%. Comparing base (67a162e) to head (eadc2c2).

Files with missing lines	Patch %	Lines
MetaMorpheus/EngineLayer/PrecursorSet.cs	97.82%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2554      +/-   ##
==========================================
+ Coverage   94.71%   96.63%   +1.91%     
==========================================
  Files         158      160       +2     
  Lines       17548    23996    +6448     
  Branches     3293     3339      +46     
==========================================
+ Hits        16621    23188    +6567     
- Misses        508      803     +295     
+ Partials      419        5     -414     

Flag	Coverage Δ
unittests	94.74% <99.14%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
MetaMorpheus/EngineLayer/SelectedPrecursors.cs	100.00% <100.00%> (ø)
MetaMorpheus/EngineLayer/PrecursorSet.cs	97.82% <97.82%> (ø)

... and 152 files with indirect coverage changes

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