Use 64 bit integers for RoctracerLogger::maxBufferSize_ instead of 32 bit

[RElbers]

The Roctracer has a limit on the max number of GPU events before it stops tracing. This limit was stored in a uint32_t variable maxBufferSize_. This limit can be changed using ROCTRACER_MAX_EVENTS, which is parsed as a signed int32_t. This means that there is still a hard limit on the number of GPU events at just over 2.1 billion (2^31 − 1). This may sound like an unreasonable number of events in a single trace, but I think users should at least be given the option to do so. And right now, it's impossible given the 32bit types.

This pull requests changes the relevant types to 64 bit integers. For extra context, the maxBufferSize_ is being compared to a size_t and logged here.

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