fix: Do not escape possible other editors syntax when serializing

[juliusknorr]

This is a first attempt to resolve https://github.com/nextcloud/text/issues/4795 and https://github.com/nextcloud/text/issues/6864

Mostly just a hacky fix for now, i need to think a bit more about in which cases we may want to skip the escape and in which not

• [ ] Check for side effects with cases like https://github.com/nextcloud/text/issues/931
• [ ] See how we want to handle \[ and \\[ in the markdown source

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.08%. Comparing base (7bec591) to head (7ef7b00). Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7300      +/-   ##
==========================================
+ Coverage   58.89%   59.08%   +0.18%     
==========================================
  Files         289      482     +193     
  Lines       36816    37109     +293     
  Branches      853     1063     +210     
==========================================
+ Hits        21682    21924     +242     
- Misses      15032    15083      +51     
  Partials      102      102              

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