Support `restrictedToMinimumLevel` when configuring Serilog in code

[jamescrosswell]

Description

Serilog supports per sink minimum levels for logs.

We have a extension method that we encourage people to use, which configures a Sentry sink for Serilog, but it does not let SDK users specify this argument (which would need to be passed on here):

sentry-dotnet/src/Sentry.Serilog/SentrySinkExtensions.cs

Line 367 in d3d2f71

return loggerConfiguration.Sink(new SentrySink(options, sdkDisposable));

The only way to configure that currently is by using configuration bindings (e.g. appsettings.json)... probably OK for ASP.NET Core users... bit of a pain for MAUI users though.

NOTE

It is still possible to configure a "global" minimum level for structured logs in code... just not per sink levels. For example:

sentry-dotnet/samples/Sentry.Samples.AspNetCore.Serilog/Program.cs

Lines 12 to 15 in 5f6e7b4

	var builder = WebApplication.CreateBuilder(args);
	builder.Host.UseSerilog((_, c) =>
	c.Enrich.FromLogContext()
	.MinimumLevel.Debug()

[linear]

NET-596