Criteo: Add support for paapi

[github-actions[bot]]

Code coverage summary

Note:

• Prebid team doesn't anticipate tests covering code paths that might result in marshal and unmarshal errors

• Coverage summary encompasses all commits leading up to the latest one, 2a765a8181d005f82c64e22c148768a7190e1802

  criteo

  Refer here for heat map coverage report

  github.com/prebid/prebid-server/v2/adapters/criteo/criteo.go:43:    Builder     100.0%
  github.com/prebid/prebid-server/v2/adapters/criteo/criteo.go:51:    MakeRequests    80.0%
  github.com/prebid/prebid-server/v2/adapters/criteo/criteo.go:67:    MakeBids    92.9%
  github.com/prebid/prebid-server/v2/adapters/criteo/criteo.go:130:   getBidMeta  100.0%
  total:                                  (statements)    92.3%