Added optional use of new v1 StatusCake API

[CloudPlatformer]

StatusCake have a new beta API available https://www.statuscake.com/api/v1/

The new Get all uptime tests endpoint https://www.statuscake.com/api/v1/#operation/list-uptime-tests provides paged responses to get all tests, overcoming the limit of only 100 tests in the response from the legacy API https://www.statuscake.com/api/Tests/Get%20All%20Tests.md

Environment variables USE_V1_UPTIME_ENDPOINTS and USE_V1_MAINTENANCE_WINDOWS_ENDPOINTS are used to enable use of the v1 API.

As per https://www.statuscake.com/api/v1/#tag/uptime:

NOTE: the API endpoints concerned with maintenance windows will only work with accounts registed to use the newer version of maintenance windows. This version of maintenance windows is incompatible with the original version and all existing windows will require migrating to be further used. Presently a tool to automate the migration of maintenance windows is under development.

Similarly, if an account is registered to use the newer version of maintenance windows, the legacy API's maintenance windows endpoints cannot be used.

Resolves #6