Add engine exception handling middleware

[raymonddenhaan]

Integrate new EngineExceptionHandlingMiddleware into the workflow execution pipeline to catch and log exceptions outside of running workflow activity.

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This change is 

[sfmskywalker]

I think this is the wrong fix and instead we should change this line, to:

if (!ValidateStatusTransition(subStatus))

[raymonddenhaan]

I did not make a fix here, just removed code that was not used. The validate method is not so much checking if the new state can be moved to as it is checking if the current state is finished and therefor a state that can be moved from. Sending the target sub status and using it instead of the current SubStatus will prevent us from moving to the Finished state.

[sfmskywalker]

I understand. I'm just wondering if the original code is a mistake and whether it should have been using the parameter instead of the property. I'll add a TODO to follow up.

[sfmskywalker]

Suggested change

	if (!ValidateStatusTransition())
	if (!ValidateStatusTransition(subStatus))

[sfmskywalker]

Suggested change

	if (!ValidateStatusTransition())
	// TODO: Check if this method should be using `targetSubStatus` instead of `SubStatus`.
	private bool ValidateStatusTransition(WorkflowSubStatus targetSubStatus)
	private bool ValidateStatusTransition()
	{
	var currentMainStatus = GetMainStatus(SubStatus);

[sfmskywalker]

Suggested change

	private bool ValidateStatusTransition()
	private bool ValidateStatusTransition(WorkflowSubStatus subStatus)

[sfmskywalker]

Suggested change

	var currentMainStatus = GetMainStatus(SubStatus);
	var currentMainStatus = GetMainStatus(subStatus);

[sfmskywalker]

Not a big deal (at all), but it gave me a giggle to see the effort that was made in the WorkflowExecutionContext where all the ///<summary> lines were removed, but are added here 😄

[Suchiman]

Why was the <summary> removed? without that, VS does not display documentation anymore

[sfmskywalker]

To reduce the amount of noise in a file. However, we weren’t aware that this would break VS.

[Suchiman]

You can change it from

/// <summary>
/// description
/// </summary>

to

/// <summary>description</summary>

if you desire a more compact format, without breaking VS.