Support Vec<Vec<u8>> for CST/DCO codec (SSE codec already supports it)

[fzyzcjy]

Depend on shekohex/allo-isolate#57

[fzyzcjy]

still awaiting allo-isolate to release next version (currently hacked the dependency, thus CI red)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aeb9c9c) 99.26% compared to head (a484c73) 99.23%.
Report is 44 commits behind head on master.

❗ Current head a484c73 differs from pull request most recent head b8d2ce7. Consider uploading reports for the commit b8d2ce7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1663      +/-   ##
==========================================
- Coverage   99.26%   99.23%   -0.03%     
==========================================
  Files         345      345              
  Lines       14097    14076      -21     
==========================================
- Hits        13994    13969      -25     
- Misses        103      107       +4     

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