Replace generic RuntimeException with HopRuntimeException to satisfy Sonar rules

[leehaut]

This PR replaces usages of RuntimeException with the custom HopRuntimeException across the codebase.

The change addresses Sonar rule:

"Replace generic exceptions with specific library exceptions or a custom exception."

By using HopRuntimeException, we improve exception clarity and align with project-specific error handling practices.

[hansva]

Hi @leehaut,
We would like to invite you to become a committer to the project.
If you are interested could you reach out to hansva@a.o (replace a.o with the full domain name).

[leehaut]

Hi @leehaut, We would like to invite you to become a committer to the project. If you are interested could you reach out to hansva@a.o (replace a.o with the full domain name).

Thank you for the invitation! I’m honored to be considered.

I’ve sent an email to Hans and look forward to the next steps.