Fix issue #468

[caguero]

🦟 Bug fix

Fixes #468

Summary

As described in issue #468, the case of a Request() before an Advertise() when both calls are within the same process wasn't considered. This patch makes it work as in the case where requester and responser are in different processes (which was already working).

Checklist

• [x] Signed all commits for DCO
• [x] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (764a04b) 87.80% compared to head (ec324d2) 87.83%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## gz-transport13 #470 +/- ## ================================================== + Coverage 87.80% 87.83% +0.02% ================================================== Files 59 59 Lines 5699 5704 +5 ================================================== + Hits 5004 5010 +6 + Misses 695 694 -1 ```

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