RD-4424 - cold start indication in pre-invocation calls

[saartochner-lumigo]

If someone initializes an AWS connection during the cold start phase, then we will create a spans_container, thus marking this container as “hot”.
I changed the behavior to mark it as “hot” only when creating a span_container due to invocation start.

[codecov]

Codecov Report

Merging #177 (5e1d7c3) into master (827a7a9) will increase coverage by 1.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
+ Coverage   96.21%   97.45%   +1.23%     
==========================================
  Files          11       22      +11     
  Lines         952     1767     +815     
==========================================
+ Hits          916     1722     +806     
- Misses         36       45       +9     

Impacted Files	Coverage Δ
lumigo_tracer/parsers/utils.py
lumigo_tracer/sync_http/handler.py
lumigo_tracer/utils.py
lumigo_tracer/parsers/parser.py
lumigo_tracer/sync_http/sync_hook.py
lumigo_tracer/parsers/http_data_classes.py
lumigo_tracer/parsers/event_parser.py
lumigo_tracer/wrappers/http/http_data_classes.py	100.00% <0.00%> (ø)
lumigo_tracer/lumigo_utils.py	95.30% <0.00%> (ø)
lumigo_tracer/auto_instrument_handler.py	100.00% <0.00%> (ø)
... and 16 more

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