Add application_name to connection

[mipyykko]

A bit more information for logging and stats.

[codecov[bot]]

Codecov Report

Merging #859 (05f33db) into master (c579c6c) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #859   +/-   ##
=======================================
  Coverage   90.34%   90.34%           
=======================================
  Files          64       64           
  Lines        2062     2062           
  Branches      277      277           
=======================================
  Hits         1863     1863           
  Misses        192      192           
  Partials        7        7           

Impacted Files	Coverage Δ
packages/backendv2/knexfile.ts	100.00% <ø> (ø)

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