Refine devcontainer configuration with gradle

[alexcombessie]

Description

Related Issue

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've read the CODE_OF_CONDUCT.md document.
• I've read the CONTRIBUTING.md guide.
• I've updated the code style using make codestyle.
• I've written tests for all new methods and classes that I created.
• I've written the docstring in Google format for all the methods and classes that I used.

[andreybavt]

@alexcombessie , I checked, with the latest fix everything does work without CORS issues

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[alexcombessie]

After epic struggles which master @andreybavt kenobi, we have decided not to pursue this pull request.

@andreybavt managed to make it work, but it requires the user to make port 9000 of the github codespace public. It is a manual action which is not great for security purposes.

In addition to this, we are not fully convinced that github codespace is the best way to onboard new internal and external developers. It implies an important server cost, and the setup is quite involved.

Let's close this PR and focus on documenting the local dev setup on VScode for now.