Is your feature request related to a problem? Please describe.
Feature Request

Describe the solution you'd like
Support Transaction Checks for Pingdom.
Because Pingdom does not support a cookie store, authentication headers are not persistent and if you rely on authenticated user after redirect the checks fails. As Alternative we can implement Transaction Checks which would allow keeping JWT token etc within one check

Describe alternatives you've considered

Additional context
Because the model is very different to uptime check we can create a new pingdom transaction provider. Besides that we require a new client because transaction are not supported by used client. Instead we use newly created client. https://github.com/karlderkaefer/pingdom-golang-client