docs: improvement in root package.json file

[hkv24]

Description
Tried to add unit test, integration test, build command for nunjucks-filter package in root package.json file.

#Refs #1310

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Latest commit: 83c0d64

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[derberg]

thanks but I have some questions:

• why all these changes in package-lock? how is it related to your pr?
• did you check if all the scripts you enable on root are actually there in the app? scripts for nunjucks filter are pretty limited https://github.com/asyncapi/generator/blob/master/apps/nunjucks-filters/package.json