Add ability to set Event startTime and endTime

[kxc171]

Is your feature request related to a problem? Please describe. I would like to be able to specify the startTime and endTime for an event, as mentioned in the Events v2 API.

Describe the solution you'd like The YAML list for defining events should match the Request body object and all it's options, as described in the API.

Describe alternatives you've considered Alternatives would be querying the API directly instead of through the Action.

Additional context This is hardcoded to not include these values as part of the payload, so there is no way to workaround this. https://github.com/dynatrace-oss/dynatrace-github-action/blob/main/src/dynatrace.ts#L117-L123