Add a way to reset GSDK in cppsdk

[artkuy]

This PR modifies the cppsdk to add a way to stop GSDK before calling exit() or exiting main.

Allows user to control lifetime of GSDK, needed to prevent allocations from happening after custom memory allocator has been destroyed. This is done by GSDK::logMessage from the heartbeat thread.

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[dgkanatsios]

hey @artkuy thanks for the contribution. This looks like a change in the public GSDK API, which makes it hard to accept since we'll have to change all other implementations as well.

Can you shed more light on the issue your PR tries to solve? Maybe there's something else we can do on the C++ side to prevent this issue from happening.

[artkuy]

Hi @dgkanatsios, in our use case it's a problem that static std::unique_ptr<GSDKInternal> m_instance; is static. Since it won't deconstruct itself until after main is exited or exit() is called. When new and delete are overridden and a custom allocator is used it is possible for an exit crash to occur in std::locale from GSDK::logMessage called from the heartbeat thread. Because GSDK is destroyed after the custom allocator.

We need a way to control the lifetime of GSDK and stop it before we destroy our memory allocator.

[dgkanatsios]

thank you for the explanation - I have asked C++ experts in our team to take a look at it.
Quick question: you mention the crash can be caused by the logMessage method - is there any chance we can change that method to prevent the crash?

[artkuy]

Perhaps, but this seems rather prone to future issues as it's any dynamic allocation that would cause crashing. So any future addition to the project could quickly break it again.