Fix for bugs appeared when using function calls with clear history functionality (#1531)

* resolved errors happening when using function calling and clear history

* checking in nr_of_messages_to_preserve were provided

* code formatting

* test added, dict signature improved

* test added, dict signature improved

* test added, dict signature improved

* test added, dict signature improved

* test added, dict signature improved

* test added, dict signature improved

* test added, dict signature improved

* test added, dict signature improved

* Test updated

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* test improved

* test improved

* comment about preserving additional message added

* commentary about clear history called in tool response improved

* created test for clear hisotry called from tool response

* code formatting

* added 'USER INTERRUPTED' as internal content of tool response

* added separate vatiable 'nr_messages_to_preserve_internal'

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Co-authored-by: Chi Wang <wang.chi@microsoft.com>