[MERGE] feat(proxy-wasm) new 'request.is_subrequest' property

[thibaultcha]

Introduce a new request property request.is_subrequest to indicate whether the current request is a subrequest of an existing request (e.g. in slicing scenarios).

Note: Although the property uses the request.* prefix, this is not an Envoy attribute.

• documentation

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.83458%. Comparing base (0c9eeed) to head (312c4b0).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/common/proxy_wasm/ngx_proxy_wasm_properties.c	92.85714%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main        #666         +/-   ##
===================================================
+ Coverage   90.79446%   90.83458%   +0.04012%     
===================================================
  Files             53          53                 
  Lines          11341       11347          +6     
  Branches        1690        1690                 
===================================================
+ Hits           10297       10307         +10     
+ Misses          1038        1034          -4     
  Partials           6           6                 

Files with missing lines	Coverage Δ
src/common/proxy_wasm/ngx_proxy_wasm_properties.c	89.71554% <92.85714%> (+0.58029%)	⬆️

... and 1 file with indirect coverage changes

Flag	Coverage Δ
unit	90.57797% <100.00000%> (+0.02670%)	⬆️
valgrind	82.48830% <57.14286%> (+0.02975%)	⬆️

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