Add more tests `check_camtrapdp()`

[peterdesmet]

• Check that deployments, media and observations data frames are present.
• Provide more context for what went wrong. See the general_message, tip_message approach in https://github.com/frictionlessdata/frictionless-r/blob/main/R/check_package.R
• Write tests, see https://github.com/frictionlessdata/frictionless-r/blob/main/tests/testthat/test-check_package.R