Add cleaning of the allInvocations property in the MockingContext on …

[azat-dev]

Add cleaning of the allInvocations property in the MockingContext on calling the clearInvocations method

Overview

When I use the mockingbird in my projects, a memory leakage detection tests often fail. I've found out that when we call 'clearInvocations' method it never cleans the 'allInvocations' property, so it leads to failing of memory leakage tests