refactor(examples/express): small refactor of imports

[trentm]

Minor refactor to clean up imports from the api pkg.
Remove the DiagConsoleLogger for now. There isn't any useful diag log output
for this example, and configuring it just adds some noise.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.80%. Comparing base (d7773a2) to head (8c19655).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2562      +/-   ##
==========================================
+ Coverage   90.75%   90.80%   +0.04%     
==========================================
  Files         169      169              
  Lines        8018     8018              
  Branches     1632     1632              
==========================================
+ Hits         7277     7281       +4     
+ Misses        741      737       -4     

see 1 file with indirect coverage changes