fix(axiom): handle locale for dt w3c priority

[bduranleau-nr]

Account for locale differences when generating the DT w3c tracestate header.
Mitigates a risk against unexpected locale settings using , rather than . for the decimal priority value breaking the PHP Agent's DT w3c handling.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (bf0223c) 78.74% compared to head (d1110c5) 78.69%.
Report is 8 commits behind head on dev.

Files	Patch %	Lines
axiom/nr_distributed_trace.c	80.00%	3 Missing ⚠️
agent/php_nrini.c	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #828      +/-   ##
==========================================
- Coverage   78.74%   78.69%   -0.06%     
==========================================
  Files         189      191       +2     
  Lines       26370    26599     +229     
==========================================
+ Hits        20766    20933     +167     
- Misses       5604     5666      +62     

Flag	Coverage Δ
agent-for-php-7.0	77.55% <80.00%> (-0.05%)	⬇️
agent-for-php-7.1	77.28% <79.16%> (-0.06%)	⬇️
agent-for-php-7.2	77.85% <79.16%> (-0.05%)	⬇️
agent-for-php-7.3	77.87% <79.16%> (-0.05%)	⬇️
agent-for-php-7.4	77.53% <79.16%> (-0.05%)	⬇️
agent-for-php-8.0	77.63% <79.16%> (-0.05%)	⬇️
agent-for-php-8.1	77.59% <79.16%> (-0.05%)	⬇️
agent-for-php-8.2	77.37% <79.16%> (-0.05%)	⬇️
agent-for-php-8.3	77.37% <79.16%> (-0.05%)	⬇️

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