Replace file path configuration of `NLogFileConsumer` with single `WithFileNameTemplate` method

[Yevgeniy Shunevych]

Added NLogFileConsumer property:

/// <summary>
/// Gets or sets the file name template.
/// The default value is <c>"Trace.log"</c>.
/// </summary>
public string FileNameTemplate { get; set; }

Removed NLogFileConsumer properties:

• DirectoryPathBuilder
• FileNameBuilder
• FilePathBuilder

Added LogConsumerAtataContextBuilder<NLogFileConsumer> configuration extension method:

/// <summary>
/// Sets the file name template of the log file.
/// The default value is <c>"Trace.log"</c>.
/// </summary>
/// <param name="builder">The builder.</param>
/// <param name="fileNameTemplate">The file name template.</param>
/// <returns>The same builder instance.</returns>
public static LogConsumerAtataContextBuilder<NLogFileConsumer> WithFileNameTemplate(
    this LogConsumerAtataContextBuilder<NLogFileConsumer> builder,
    string fileNameTemplate)

Removed LogConsumerAtataContextBuilder<NLogFileConsumer> configuration extension methods:

• WithArtifactsDirectoryPath
• WithDirectoryPath
• WithFilePath
• WithFileName