[blk-threaded - 11/12] api: expose threaded virtio-block

[PierreBertholom]

[11/12] part of the PR stack starting with #6123

Changes

Add the threaded option to Swagger, Rust configuration, snapshot
serialization, and Python framework helpers.
Default to inline mode and reject threaded vhost-user configurations.

[codecov]

Codecov Report

❌ Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.84%. Comparing base (083f96e) to head (1e4d9dc).

Files with missing lines	Patch %	Lines
src/vmm/src/devices/virtio/block/device.rs	50.00%	3 Missing ⚠️
.../vmm/src/devices/virtio/block/vhost_user/device.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##           pbertho/blk-threaded-10    #6133      +/-   ##
===========================================================
- Coverage                    81.85%   81.84%   -0.01%     
===========================================================
  Files                          278      278              
  Lines                        31657    31669      +12     
===========================================================
+ Hits                         25913    25920       +7     
- Misses                        5744     5749       +5     

Flag	Coverage Δ
5.10-m5n.metal	81.99% <64.28%> (-0.01%)	⬇️
5.10-m6a.metal	81.33% <64.28%> (-0.01%)	⬇️
5.10-m6g.metal	78.84% <64.28%> (-0.01%)	⬇️
5.10-m6i.metal	81.99% <64.28%> (-0.02%)	⬇️
5.10-m7a.metal-48xl	81.32% <64.28%> (-0.01%)	⬇️
5.10-m7g.metal	78.84% <64.28%> (-0.01%)	⬇️
5.10-m7i.metal-24xl	81.97% <64.28%> (-0.01%)	⬇️
5.10-m7i.metal-48xl	81.97% <64.28%> (-0.01%)	⬇️
5.10-m8g.metal-24xl	78.84% <64.28%> (-0.01%)	⬇️
5.10-m8g.metal-48xl	78.84% <64.28%> (-0.02%)	⬇️
5.10-m8i.metal-48xl	81.97% <64.28%> (-0.01%)	⬇️
5.10-m8i.metal-96xl	81.97% <64.28%> (-0.01%)	⬇️
6.1-m5n.metal	82.01% <64.28%> (-0.01%)	⬇️
6.1-m6a.metal	81.35% <64.28%> (-0.01%)	⬇️
6.1-m6g.metal	78.84% <64.28%> (-0.01%)	⬇️
6.1-m6i.metal	82.01% <64.28%> (-0.01%)	⬇️
6.1-m7a.metal-48xl	81.34% <64.28%> (-0.01%)	⬇️
6.1-m7g.metal	78.84% <64.28%> (-0.01%)	⬇️
6.1-m7i.metal-24xl	82.02% <64.28%> (-0.01%)	⬇️
6.1-m7i.metal-48xl	82.02% <64.28%> (-0.01%)	⬇️
6.1-m8g.metal-24xl	78.84% <64.28%> (-0.02%)	⬇️
6.1-m8g.metal-48xl	78.84% <64.28%> (-0.01%)	⬇️
6.1-m8i.metal-48xl	82.03% <64.28%> (-0.01%)	⬇️
6.1-m8i.metal-96xl	82.02% <64.28%> (-0.01%)	⬇️
6.18-m5n.metal	82.01% <64.28%> (-0.01%)	⬇️
6.18-m6a.metal	81.35% <64.28%> (-0.01%)	⬇️
6.18-m6g.metal	78.84% <64.28%> (-0.01%)	⬇️
6.18-m6i.metal	82.01% <64.28%> (-0.01%)	⬇️
6.18-m7a.metal-48xl	81.34% <64.28%> (-0.01%)	⬇️
6.18-m7g.metal	78.84% <64.28%> (-0.02%)	⬇️
6.18-m7i.metal-24xl	82.02% <64.28%> (-0.01%)	⬇️
6.18-m7i.metal-48xl	82.02% <64.28%> (-0.01%)	⬇️
6.18-m8g.metal-24xl	78.84% <64.28%> (-0.01%)	⬇️
6.18-m8g.metal-48xl	78.84% <64.28%> (-0.01%)	⬇️
6.18-m8i.metal-48xl	82.03% <64.28%> (-0.01%)	⬇️
6.18-m8i.metal-96xl	82.03% <64.28%> (-0.01%)	⬇️

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