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* Implement warmup-runs count, supported as CLI CLI option --warmup-runs implemented and documented. The warm-up counts is enforced to always be positive. This is necessary to ensure that JIT-ting has occurred, and use of blocking kernel would not result in time-outs. Test is option parser is added. * Ensure that measure_cold::run_warmup instantiates blocking kernel Because warm-up runs are executed without use of blocking kernel, the blocking kernel was not jitted until actual measurements were collected. The module loading cost incurred during the first run shows as elevated CPU time noise value for the first measurement as noted in https://github.com/NVIDIA/nvbench/pull/339 This PR adds `this->block_stream(); this->unblock_stream();` prior to executing warm-up loop with use of blocking kernel disabled. This ensures that blocking kernel is instantiated during the warm-up, but it no other kernel is launched between its launch and stream sync thus avoiding deadlocking. * Rename --warmup-runs to --cold-warmup-runs, add --cold-max-warmup-walltime Since configurable number of warmups only applies to measure_cold.cuh rename the CLI option to reflect that. Also add --cold-max-warmup-walltime (defaults to -1, i.e. disabled). If enabled, exits warmup loop before request count is reached if the wall-time expanded executign warmups exceeds this max-warmup-walltime value.