Escape NULL

[evgeniy-r]

✓ Checklist:

• This PR has been added to CHANGELOG.md (at the top of the list);
• Tests for the changes have been added (for bug fixes / features);
• Docs have been added / updated (for bug fixes / features).

[codecov-commenter]

Codecov Report

Merging #98 (e71dbc4) into main (1cd3402) will increase coverage by 0.19%.
The diff coverage is 100.00%.

❗ Current head e71dbc4 differs from pull request most recent head 2c3c766. Consider uploading reports for the commit 2c3c766 to get more accurate results

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   78.43%   78.63%   +0.19%     
==========================================
  Files          50       50              
  Lines        2996     3023      +27     
==========================================
+ Hits         2350     2377      +27     
  Misses        646      646              

Impacted Files	Coverage Δ
datanymizer_dumper/src/postgres/escaper.rs	100.00% <100.00%> (ø)

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