feat(event-handler): implemented route prefixes in HTTP event handler

[sdangol]

Summary

This PR implements the feature to allow the use of prefix so that we don't need to keep repeating the same shared prefix for every route path.

Changes

Please provide a summary of what's being changed

• Added prefix option to the RestRouterOptions in the constructor
• Added the logic to append the prefix if present

Please add the issue number below, if no issue is present the PR might get blocked and not be reviewed

Issue number: closes #4513

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[dreamorosi]

@sdangol please take a look at the SonarCloud findings and address them - based on a cursory read we should be able to resolve them.

[sonarqubecloud]

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

See analysis details on SonarQube Cloud

[dreamorosi]

Thank you for this PR, I tested the package in an API and it works.

Once we work on #4131 we might need to make the prefix public so it can be accessed when passing a Router to another, but we'll see once we get there.