dev(hansbug): add extras module into scripts

[HansBug]

You can use extras in scripts like this

# .script.py

from extras import xxx  # extras is a fake module created by igm virtual environment

[codecov-commenter]

Codecov Report

Merging #2 (42a21b1) into main (0597a68) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   98.94%   98.95%           
=======================================
  Files          58       58           
  Lines        1797     1814   +17     
=======================================
+ Hits         1778     1795   +17     
  Misses         19       19           

Flag	Coverage Δ
unittests	98.95% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
igm/render/script.py	100.00% <100.00%> (ø)

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