Use deployment approval for nuget push

[FelixS90]

Is your feature request related to a problem? Please describe.
With #29, there is no additional deployment check prior to publishing the package to nuget.org (not in effect until NUGETAPI_KEY is set as either a repository or an environment secret).

Describe the solution you'd like
As a follow-up to #29, I suggest Using environments for deployment - GitHub Enterprise Cloud Docs].

Describe alternatives you've considered
None

Additional context
This should be ideally combined with ID Prefix Reservation | Microsoft Learn.

As a reference, we can look at https://github.com/ZEISS/pylibczirw (publishing to PyPI). Here, we also make use of conventional/angular commit message style and auto-version bumping based on tags derived from the commit message - similar to how it is proposed with [deploy-nuget] in #29.