chore: add .gitattributes file for EOL normalization

[gnikit]

• add .gitattributes for non-vscode editors
• replace single with double quotes (and escape them) in the prettier call to be shell-agnostic.

[codecov]

Codecov Report

Merging #961 (071a160) into main (7ec3798) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #961   +/-   ##
=======================================
  Coverage   83.60%   83.60%           
=======================================
  Files          12       12           
  Lines        2305     2305           
  Branches      205      205           
=======================================
  Hits         1927     1927           
  Misses        373      373           
  Partials        5        5           

[michaelkonecny]

The escaped double quotes work fine, thank you.

As for .gitattributes, you need to add another line:

* eol=lf

for it to work.

After that, everything seems to work fine - the repo gets checked out with LFs even though core.autocrlf=true and vscode correctly detects the files having LF and works with them in this mode, so no need to set anything there.

[gnikit]

@michaelkonecny awesome, I will add it and merge. Please do not about my comment on the now closed PR #955, all scripts in package.json using && will not work in powershell.