Conan package for RapidJSON use CMake's naming convention

[jgsogo]

Conan package for RapidJSON now uses the same naming convention as CMake module.

This change has been already submitted to ConanCenter for existing packages: conan-io/conan-center-index#1579, sending it here so the next versions no longer need to apply the patch.

Let's take care of this project 💪

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.82%. Comparing base (889577d) to head (bf48409).
⚠️ Report is 60 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #197   +/-   ##
=======================================
  Coverage   88.82%   88.82%           
=======================================
  Files          71       71           
  Lines        9072     9076    +4     
=======================================
+ Hits         8058     8062    +4     
  Misses       1014     1014           

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