feat: add clientless RabbitMQ service

[cofin]

Summary\n\n- add RabbitMQ 4.3 fixtures using bundled rabbitmq-diagnostics, rabbitmqctl, and rabbitmqadmin\n- expose custom credentials and AMQP URL with per-worker virtual-host or broker isolation\n- keep the management port internal and register one-provider selective CI ownership\n\n## Validation\n\n- provider tests: 3 passed\n- Ruff, mypy, pyright, and docs passed\n- selector: 1 provider job, 1 image pull\n- no AMQP Python client dependency or lockfile change\n\nPart of #150.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.28916% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 10.30%. Comparing base (ba9c758) to head (633edd7).

Files with missing lines	Patch %	Lines
src/pytest_databases/docker/rabbitmq.py	72.28%	17 Missing and 6 partials ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           feat/podman-support     #158      +/-   ##
=======================================================
- Coverage                11.95%   10.30%   -1.66%     
=======================================================
  Files                       24       25       +1     
  Lines                     2082     2165      +83     
  Branches                   169      177       +8     
=======================================================
- Hits                       249      223      -26     
- Misses                    1798     1891      +93     
- Partials                    35       51      +16     

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