AtataContext static mode

[YevgeniyShunevych]

Support static AtataContext mode. Currently AtataContext.Current uses [ThreadStatic] backing field.

Add property to AtataContext with default true value:

public static bool IsThreadStatic { get; set; }

Thread-static mode - AtataContext.Current uses thread-static (unique for each thread) value. Is good for environment with parallel test execution.

Static mode - AtataContext.Current uses static (common for all threads) value. Is good for environment with asynchronous actions, but without parallel test execution.

Usage

If you need to enable static mode, in one-time set up method set the following:

[OneTimeSetUp]
public void SetUp()
{
    AtataContext.IsThreadStatic = false;
}