[as2_ign_gazebo_assets] added use_sim_time parameter

[javilinos]

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Basic Info

Info	Please fill out this column
Issue(s) this addresses	sim to real objects
ROS2 version tested on	Humble
Aerial platform tested on	Ignition

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Description of contribution in a few bullet points

• Added use_sim_time parameter to as2_ign_gazebo_assets
• use_sim_time to false deactivates sim clock and make external objects publish their tf in system clock

Description of documentation updates required from your changes

• Maybe some sim to real stuff as we are using objects from simulation publishing tf's in system clock so they can be used in a real test and be visualized in rviz.

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[codecov-commenter]

Codecov Report

Merging #203 (f88a6cc) into main (f2d29d5) will increase coverage by 0.07%.
The diff coverage is n/a.

❗ Current head f88a6cc differs from pull request most recent head 16b7582. Consider uploading reports for the commit 16b7582 to get more accurate results

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@@           Coverage Diff            @@
##            main    #203      +/-   ##
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+ Coverage   3.13%   3.21%   +0.07%     
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  Files         99      99              
  Lines       5135    5201      +66     
  Branches     451     476      +25     
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+ Hits         161     167       +6     
- Misses      4836    4868      +32     
- Partials     138     166      +28     

Flag	Coverage Δ
unittests	3.21% <ø> (+0.07%)	⬆️

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see 21 files with indirect coverage changes

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