Use auto-property instead of expression-bodied syntax

[ArminShoeibi]

Hey there,

In the MyMetricsRegistry class, there are two properties named Errors and Errors2 that define instances of the GaugeOptions class. While both properties serve the same purpose, they have slightly different behavior, which may not be immediately clear to developers who are new to the codebase.

Errors property returns a single instance of GaugeOptions, whereas Errors2 creates a new instance of GaugeOptions every time it is accessed.

public static class MyMetricsRegistry
{
    public static GaugeOptions Errors { get; } = new GaugeOptions
    {
        Name = "Errors"
    };

    public static GaugeOptions Errors2 => new GaugeOptions
    {
        Name = "Errors2"
    };
}