I am trying to use nuget package to install this dll "Sitecore.Publishing.Service.dll" but it seems that it is not there , any one know what is the nuget package for Sitecore Publishing Service dlls?
Not all modules are available (yet) in the Sitecore Nuget feed. SXA for example is not there yet, and it seems like the Publishing service is also (still) missing.
For the moment, you'll need to refer your solution to the dll locally. You can always contact Sitecore (through support / uservoice / ... ) requesting to get the Publishing service module in Nuget as well. For SXA this has been done and the team is working on it (or at least thinking about it).
SXA 4.8.0, JSS 12.0.0 and DataExchange 2.1.0 are available on MyGet for Sitecore 9.1.0 release: https://sitecore.myget.org/gallery/sc-packages
Also SIF (https://sitecore.myget.org/feed/sc-powershell/package/nuget/SitecoreInstallFramework) and SI (https://sitecore.myget.org/gallery/sc-identity) were published on MyGet as part of Sitecore 9.1.0 release.