add preserve_space option to keep original format in code blocks

[unsleepy22]

Currently preserve_space is forced False in sanitize method when converting xml to text, while for code blocks esp. python code we wish to preserve spaces to keep the original format since space matters in python.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.27%. Comparing base (91c567c) to head (eed8c0b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #772   +/-   ##
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  Coverage   99.27%   99.27%           
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  Files          21       21           
  Lines        3587     3588    +1     
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+ Hits         3561     3562    +1     
  Misses         26       26           

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[adbar]

Hi @unsleepy22, a few comments on the PR:

• I believe this fixes Preserve horizontal space in code blocks #553, could you please check?
• There is already a preserve_spaces parameter in htmlprocessing/handle_textnode, is it necessary to use a new argument across multiple functions?
• This behavior could actually become the default if there are no adverse effects, it would be easier for maintenance

Last, if you have several PRs in store about unrelated parts of the code it would be best to send them all at once, I don't plan to maintain the software on a day-to-day basis, we could both save time by grouping requests.