Replace Deku with explicit NBD and shared 9p slice codecs

[Barre]

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[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.27%. Comparing base (cfc5e15) to head (b7f6159).

Files with missing lines	Patch %	Lines
zerofs/src/nbd/server.rs	0.00%	7 Missing ⚠️
zerofs/src/mount.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #631      +/-   ##
==========================================
+ Coverage   83.24%   83.27%   +0.02%     
==========================================
  Files         104      104              
  Lines       47048    47143      +95     
==========================================
+ Hits        39167    39259      +92     
- Misses       7881     7884       +3     

Files with missing lines	Coverage Δ
zerofs/src/nbd/error.rs	0.00% <ø> (ø)
zerofs/src/nbd/handler.rs	0.00% <ø> (ø)
zerofs/src/ninep/handler.rs	97.46% <100.00%> (-0.03%)	⬇️
zerofs/src/ninep/response.rs	100.00% <100.00%> (ø)
zerofs/src/ninep/server.rs	93.57% <100.00%> (-0.01%)	⬇️
zerofs/src/mount.rs	50.81% <50.00%> (ø)
zerofs/src/nbd/server.rs	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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