add buf_alloc_and_init for debug mode

[Besroy]

This function helps the upper layer test if it is affected by the original buffer value or not.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.39%. Comparing base (370c772) to head (486f243).
Report is 24 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
- Coverage   64.29%   59.39%   -4.91%     
==========================================
  Files          72       74       +2     
  Lines        4406     4773     +367     
  Branches      555      643      +88     
==========================================
+ Hits         2833     2835       +2     
- Misses       1327     1683     +356     
- Partials      246      255       +9     

Components	Coverage Δ
AuthManager	77.77% <ø> (ø)
Cache	22.22% <ø> (-7.73%)	⬇️
FDS	71.19% <100.00%> (+0.07%)	⬆️
FileWatcher	56.25% <ø> (ø)
Flip	65.34% <ø> (ø)
gRPC	77.30% <90.00%> (+0.25%)	⬆️
Logging	15.46% <3.69%> (-14.72%)	⬇️
Metrics	80.54% <ø> (+0.33%)	⬆️
Options	100.00% <ø> (ø)
Setting	56.79% <ø> (ø)
StatusObject	73.83% <ø> (ø)
Utility	83.47% <100.00%> (+0.75%)	⬆️
Version	95.83% <ø> (ø)