tracing: make valueset macro sanitary
          #3382
        
          
      
                
     Open
            
            
          
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
Due to an import of
::tracing::field::{display, debug, Value}, macrovalueset!wasn't sanitary and would produce compile errors when identifiersdebuganddisplaywere used.This change fixes the issue and makes the macro sanitary.
Fixes: #3381
Motivation
Making sure the mentioned macro is sanitary and avoiding users from encountering unexpected compile errors.
Solution
Removed the import inside macro and used fully-qualified paths for imported items.