RD-3263 - auto-instrument: fast handler import

[saartochner-lumigo]

for original handler:

with a.py: import time; time.sleep(5)

Before change:

After change:

I.e. we moved the initialization to be in the initialization (As it would have happened if we wouldn't be there)

[codecov]

Codecov Report

Merging #142 into master will decrease coverage by 0.40%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
- Coverage   96.21%   95.81%   -0.41%     
==========================================
  Files          11       11              
  Lines         952     1147     +195     
==========================================
+ Hits          916     1099     +183     
- Misses         36       48      +12     

Impacted Files	Coverage Δ
lumigo_tracer/utils.py	88.72% <0.00%> (-1.33%)	⬇️
lumigo_tracer/sync_http/sync_hook.py	98.42% <0.00%> (-0.97%)	⬇️
lumigo_tracer/parsers/parser.py	100.00% <0.00%> (ø)
lumigo_tracer/parsers/http_data_classes.py	100.00% <0.00%> (ø)
lumigo_tracer/parsers/event_parser.py	97.70% <0.00%> (+0.02%)	⬆️
lumigo_tracer/spans_container.py	99.44% <0.00%> (+0.07%)	⬆️
lumigo_tracer/parsers/utils.py	94.91% <0.00%> (+1.25%)	⬆️
lumigo_tracer/sync_http/handler.py	100.00% <0.00%> (+11.11%)	⬆️

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