RUM-451 Update RUM attributes in spans

[xgouchet]

What does this PR do?

Add RUM info in new builtin attributes on spans.

Motivation

The APM UI expects RUM information to be in the following attributes in order to add a visual link to the RUM Session/View.

• meta._dd.application.id
• meta._dd.view.id
• meta._dd.session.id

Additional Notes

We are still keeping the legacy attributes which already had those information for compatibility purposes (e.g.: customer using those to query/filter dashboard widgets)

[codecov-commenter]

Codecov Report

Merging #1758 (152d1ce) into develop (bece8a1) will increase coverage by 0.09%.
Report is 2 commits behind head on develop.
The diff coverage is 50.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1758      +/-   ##
===========================================
+ Coverage    83.34%   83.42%   +0.09%     
===========================================
  Files          468      468              
  Lines        16304    16304              
  Branches      2431     2433       +2     
===========================================
+ Hits         13587    13601      +14     
+ Misses        2050     2035      -15     
- Partials       667      668       +1     

Files	Coverage Δ
...e/internal/domain/event/DdSpanToSpanEventMapper.kt	94.64% <50.00%> (+2.49%)	⬆️

... and 28 files with indirect coverage changes

[0xnm]

nice!