doxbee-async and doxbee-promise: add side-effects

[camillobruni]

Add Queryish.count and use it as simple side-effect in the dummy functions.

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[camillobruni]

I could not really observe any score changes (might be worth rechecking):
Before:

command = ~/.jsvu/bin/javascriptcore ./cli.js -- doxbee-async
runs    = 51
sum     = 23295.31
avg     = 456.7707843137255
geomean = 455.30697949601443
min     = 344.0        max = 490.0
result  = 457.0 ± 35.0(7.7%)
................................................................................
Skipping 5 outliers
   5                                                                ▅█▂ █▅  
   0 ▄         ▄  ▄       ▄               ▄    ▇▄▄▄▄▄ ▇▄▇▄   ▇     ▇███▄██▄▄
    365                                425.5                                 486
................................................................................
command = ~/.jsvu/bin/v8 ./cli.js -- doxbee-async
runs    = 29
sum     = 13575.28
avg     = 468.11310344827587
geomean = 467.95769924053457
min     = 443.0        max = 484.0
result  = 468.0 ± 12.0(2.6%)
................................................................................
Skipping 2 outliers
   2                                                          █    ██       
   0  █  █     █          ██ █ █                 █  ██ ██ █ █████  ███  █  █
    443                                462.0                                 481
................................................................................

After:

command = ~/.jsvu/bin/javascriptcore ./cli.js -- doxbee-async
runs    = 46
sum     = 20927.64
avg     = 454.9486956521739
geomean = 453.7823474275458
min     = 350.0        max = 483.0
result  = 455.0 ± 32.0(6.94%)
................................................................................
Skipping 4 outliers
   3                                                         ▃ ▃    ▃██ █  ▃
   0  ▆ ▆ ▆            ▆            ▆    ▆ ▆▆ ▆▆▆ ▆ ▆ ▆▆    ▆█▆█▆▆▆▆███▆█▆▆█
    387                                434.5                                 482
................................................................................

command = ~/.jsvu/bin/v8 ./cli.js -- doxbee-async
runs    = 29
sum     = 13533.57
avg     = 466.6748275862069
geomean = 466.2300745843536
min     = 418.0        max = 496.0
result  = 467.0 ± 21.0(4.43%)
................................................................................
Skipping 2 outliers
   2                      ██ █                                            █ 
   0  █   █ █ █           ██ ███ █  ██      █   ██         █ █      █ ██ ██ 
    437                                465.5                                 494
................................................................................

[Constellation]

I suggest doing similar in doxbee-promise too. Right now, dummy_1 etc. are not having side-effect much (it is just returning Promise.resolve(undefined).

[camillobruni]

Weirdly enough I start to see perf differences now

Engine	Before	After
JSC	333.0 ± 20.0(5.98%)	274.0 ± 7.60 (2.76%)
V8	563.0 ± 27.0(4.76%)	544.0 ± 30.0(5.51%)