Use SequencePoint when reporting missing resource errors

[Copilot]

When a required resource name is missing from the resource file, WriteError was called with only the message string, losing source location context. Fody's WriteError(string, SequencePoint) overload associates the error with a specific point in source, enabling IDEs and build output to navigate directly to the offending member.

Changes

• Dictionary<string, SequencePoint?> replaces HashSet<string> for requiredResourceNames — maps each resource name to the sequence point of the member that requires it
• GetSequencePoint(IMemberDefinition) — new helper that extracts the first SequencePoint from a property's getter/setter debug info; returns null for fields or when no PDB data is present
• UpdateValidationAttribute — now receives the IMemberDefinition and stores the extracted SequencePoint alongside the resource name
• EnsureRequiredResourceNamesExistInResourceFile — calls WriteError(message, sequencePoint) when a sequence point is available, falls back to WriteError(message) otherwise

private static SequencePoint? GetSequencePoint(IMemberDefinition memberDefinition)
{
    MethodDefinition? method = null;
    if (memberDefinition is PropertyDefinition property)
        method = property.GetMethod ?? property.SetMethod;

    return method?.DebugInformation?.SequencePoints?.FirstOrDefault();
}

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