AN-8945: Call reset() to delete ByteStream in ResourceStream

[ZakHsieh]

Original implementation will cause huge memory leakages when Java layer acquire a resource, the ByteStream is never been released due to calling release() won't delete the memory allocation.
I'd change the _ptr.release() to _ptr.reset() to unlink the pointer and release the memory of ByteStream.

[danielweck]

Although I have not tested this code change myself, I provided technical details in this reply to the original Pull Request:
#307 (comment)
As you can see, my preferred solution is the same as the one @ZakHsieh proposes in this Pull Request, so I personally approve this PR in principle (again, untested code at my end, but high degree of confidence that this works, especially as this is in production at @ZakHsieh 's company).
@rkwright feel free to merge if you consider this a consensus :)