Introduce a Stopping state

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 56.30252% with 52 lines in your changes are missing coverage. Please review.

Project coverage is 88.74%. Comparing base (1affcb3) to head (9c5d246). Report is 25 commits behind head on add-force-stop.

:exclamation: Current head 9c5d246 differs from pull request most recent head 89b4ab1. Consider uploading reports for the commit 89b4ab1 to get more accurate results

Files	Patch %	Lines
src/daemon/daemon.cpp	20.00%	24 Missing :warning:
...rc/platform/backends/qemu/qemu_virtual_machine.cpp	64.10%	14 Missing :warning:
...tform/backends/libvirt/libvirt_virtual_machine.cpp	40.90%	13 Missing :warning:
src/platform/backends/lxd/lxd_virtual_machine.cpp	95.45%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## add-force-stop #3483 +/- ## ================================================== - Coverage 88.89% 88.74% -0.16% ================================================== Files 254 254 Lines 14081 14149 +68 ================================================== + Hits 12517 12556 +39 - Misses 1564 1593 +29 ```

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