Enable support for tracing in the Python target

[Soroosh129]

From HelloWorld.lf:

target Python {
    tracing: true  // Now supported
};
...

[lhstrh]

🚀🚀🚀

[codecov]

Codecov Report

Merging #568 (5899b68) into master (ec1f83c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #568   +/-   ##
=========================================
  Coverage     66.43%   66.43%           
- Complexity     3466     3469    +3     
=========================================
  Files           132      132           
  Lines         22294    22303    +9     
  Branches       2876     2879    +3     
=========================================
+ Hits          14810    14818    +8     
- Misses         6345     6346    +1     
  Partials       1139     1139           

Impacted Files	Coverage Δ
org.lflang/src/org/lflang/TargetProperty.java	85.75% <100.00%> (ø)
...tend-gen/org/lflang/generator/PythonGenerator.java	80.33% <0.00%> (+0.04%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ec1f83c...5899b68. Read the comment docs.

[hokeun]

Thank you, Soroush! I confirmed that it is working fine.