use statement calls meta to read spaces

[HarrisChu]

Currently, use statements would call meta to get spaces.
It would be lower performance when loading test.

# run without use

     ✓ IsSucceed

     █ setup

     █ teardown

     checks...............: 100.00% ✓ 2711159      ✗ 0
     data_received........: 0 B     0 B/s
     data_sent............: 0 B     0 B/s
     iteration_duration...: avg=2.2ms       min=802.03µs med=1.94ms max=1s    p(90)=2.85ms p(95)=3.69ms
     iterations...........: 2711159 44421.203814/s
     latency..............: avg=1383.950544 min=519      med=1329   max=28332 p(90)=1810   p(95)=2001
     responseTime.........: avg=1971.405994 min=697      med=1806   max=40428 p(90)=2580   p(95)=3092
     vus..................: 100     min=0          max=100
     vus_max..............: 100     min=100        max=100

# run with use space, e.g. use sf100; go from 2608 from KNOWS
✓ IsSucceed

     █ setup

     █ teardown

     checks...............: 100.00% ✓ 1929002      ✗ 0
     data_received........: 0 B     0 B/s
     data_sent............: 0 B     0 B/s
     iteration_duration...: avg=3.09ms      min=1.29ms med=2.85ms max=1.07s p(90)=3.84ms p(95)=4.71ms
     iterations...........: 1929002 31572.300253/s
     latency..............: avg=2206.8864   min=938    med=2157   max=21773 p(90)=2720   p(95)=2930
     responseTime.........: avg=2843.687774 min=1141   med=2678   max=32170 p(90)=3540   p(95)=4092
     vus..................: 100     min=0          max=100
     vus_max..............: 100     min=100        max=100

[Sophie-Xie]

#3097

[HarrisChu]

fixed by #2833