Dot format ascii

[koniksedy]

This PR includes:

• Modification of the method Nft::print_to_DOT(), enabling it to translate EPSILON to <eps> and DONT_CARE to <dcare>.
• Added functionality for methods Nfa::print_to_DOT() and `Nft::print_to_DOT(), allowing them to translate transition printable symbols (< 33) into ASCII.

I believe these modifications will make DOT graphs easier to understand.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 73.32%. Comparing base (be76747) to head (485b91e).
Report is 1 commits behind head on states_with_levels.

Files	Patch %	Lines
src/nft/nft.cc	0.00%	16 Missing ⚠️
src/nfa/nfa.cc	0.00%	10 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           states_with_levels     #392      +/-   ##
======================================================
- Coverage               73.63%   73.32%   -0.31%     
======================================================
  Files                      43       43              
  Lines                    5150     5170      +20     
  Branches                 1166     1173       +7     
======================================================
- Hits                     3792     3791       -1     
- Misses                    921      942      +21     
  Partials                  437      437              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Adda0]

Should be all good. I will merge the PR so we can continue.