Improve logging

[janis-veinbergs]

Solves #223

Adds such logging information:

...
Background workflow 'Some workflow name 1' completed successfully
Starting Background workflow: 'Some workflow name 2' for entity 'entity'. timeOffset: 00:00:00
Entering ActivityList. Activities Count: 32 VariableNames: 
Entering ActivityList
Entering CreateVariable. VariableName: ConditionBranchStep2_condition
Entering CreateVariable. VariableName: ConditionBranchStep2_1
Entering CreateVariable. VariableName: ConditionBranchStep2_5
Entering GetEntityProperty. Attribute: statuscode EntityId: InputEntities("primaryEntity") EntityLogicalName: entity....
Entering ActivityList. Activities Count: 6 VariableNames: 
Entering ActivityList
Entering Skip
Entering CreateVariable. VariableName: stepLabelLabelId
Entering CreateVariable. VariableName: stepLabelDescription
Entering CreateVariable. VariableName: stepLabelLanguageCode
Entering CreateVariable. VariableName: StopWorkflowStep3_1
Entering TerminateWorkflow. Status: TerminateWorkflow MessageId: Succeeded
Entering CreateVariable. VariableName: CustomActivityStep4_1
Entering ConvertType. Input: CustomActivityStep4_1, Type: String, Result: CustomActivityStep4_1_converted
Entering CreateVariable. VariableName: CustomActivityStep4_2
Entering ConvertType. Input: CustomActivityStep4_2, Type: Boolean, Result: CustomActivityStep4_2_converted
Entering CallCodeActivity. CodeActivityName: GetPostEntityImageValue
Exception thrown: 'System.Collections.Generic.KeyNotFoundException' in mscorlib.dll
An exception of type 'System.Collections.Generic.KeyNotFoundException' occurred in mscorlib.dll but was not handled in user code
The given key was not present in the dictionary.