Implement a CodeQL query for blocking the event loop

# Task Description

We should implement a query for cases blocking the event loop based on the contributed in carlspring/vertx-vulns#20.

# Open Questions

# Notes

# Task List

The following tasks will need to be carried out:
* [ ] Investigate the issue.
* [ ] Provide a solution.
* [ ] [Set up query annotations](https://codeql.github.com/docs/writing-codeql-queries/metadata-for-codeql-queries/).
* [ ] Add a query help file.
* [ ] Test the fix.
* [ ] Implement a test case.
* [ ] Test it in a pull request.
* [ ] Update the documentation.

# Useful Commands

# Incurred Costs

# Task Relationships

This task:
* Is a follow-up of:
* carlspring/vertx-vulns#20
* Is a sub-task of:
* Depends on:
* Is a follow-up of:
* Relates to:

# Resources

# Useful Links

* CodeQL
* [Query help style guide](https://github.com/github/codeql/blob/main/docs/query-help-style-guide.md)

# Points of Contact

* @carlspring
* @s4heid