quic: copy options buffer instead of detaching

[legendecas]

The certs could be allocated in a pooled buffer, like Buffer.from, and
Buffer.allocUnsafe (used by fs.readFileSync, etc).

Refs: #61372

[Renegade334]

Was going to suggest a similar approach.

The commit message should probably reflect that this applies to all buffer-based quic options, not just SessionOptions#certs.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.51%. Comparing base (e3071d5) to head (7a9130c).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/quic/data.cc	52.63%	9 Missing ⚠️
src/quic/tlscontext.cc	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61403      +/-   ##
==========================================
- Coverage   88.53%   88.51%   -0.02%     
==========================================
  Files         704      704              
  Lines      208797   208806       +9     
  Branches    40316    40308       -8     
==========================================
- Hits       184857   184834      -23     
- Misses      15923    15971      +48     
+ Partials     8017     8001      -16     

Files with missing lines	Coverage Δ
src/quic/data.h	36.36% <ø> (-27.28%)	⬇️
src/quic/endpoint.cc	56.64% <100.00%> (+0.12%)	⬆️
src/quic/tlscontext.cc	37.47% <25.00%> (+0.62%)	⬆️
src/quic/data.cc	52.08% <52.63%> (-2.67%)	⬇️

... and 33 files with indirect coverage changes

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