cuda.bindings latency benchmarks - part 2

[danielfrg]

Description

closes #1580

Follow up #1580

Adding a couple of more benchmarks here and fixing a couple of issue with the pyperf json handling.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[danielfrg]

There are the results for a run on my dev machine (4090)

----------------------------------------------------------------------------------
Benchmark                                   C++ (mean)   Python (mean)    Overhead
----------------------------------------------------------------------------------
ctx_device.ctx_get_current                        6 ns          112 ns     +106 ns
ctx_device.ctx_get_device                         8 ns          122 ns     +113 ns
ctx_device.ctx_set_current                        8 ns          103 ns      +96 ns
ctx_device.device_get                             6 ns          126 ns     +120 ns
ctx_device.device_get_attribute                   9 ns          195 ns     +186 ns
event.event_create_destroy                       90 ns          307 ns     +218 ns
event.event_query                                74 ns          215 ns     +140 ns
event.event_record                               93 ns          229 ns     +136 ns
event.event_synchronize                          94 ns          239 ns     +145 ns
launch.launch_16_args                          1.57 us         3.12 us    +1545 ns
launch.launch_16_args_pre_packed               1.58 us         1.99 us     +409 ns
launch.launch_empty_kernel                     1.54 us         1.85 us     +302 ns
launch.launch_small_kernel                     1.54 us         2.23 us     +690 ns
pointer_attributes.pointer_get_attribute         29 ns          511 ns     +482 ns
stream.stream_create_destroy                   3.78 us         4.06 us     +274 ns
stream.stream_query                              86 ns          232 ns     +145 ns
stream.stream_synchronize                       111 ns          257 ns     +146 ns
----------------------------------------------------------------------------------