[Feature] Align version in package.json and index.ts

[tobigremmer-dt]

Is your feature request related to a problem? Please describe. Currently, a "version" is maintained redundantly in package.json as well as index.ts. This is hard to automate, maintain and very prone to errors.

The version in package.json shall be re-used in index.ts.

[drqc]

solved by providing a version file to centralize version of https://github.com/dynatrace-ace/dynatrace-automation-tools/blob/main/cli/src/version.ts