Add cmdlet Update-IShSession to refresh client cache regarding TypeFieldDefinition and User properties

[ddemeyer]

New-IshSession creates an explicit or implicit $ISHRemoteSessionStateIshSession variable which will be used in all other ISHRemote cmdlets. This session object is a cached version of some server-side configuration. Some of these might require a refresh because of some event(s) outside of the ISHRemote code base. This request is to implement an Update-IshSession cmdlet which would refresh as much as possible, but will not challenge for authentication as that would be a New-IshSession.

So only expected parameter is -IshSession explictly or implicitly.

What to refresh...

• All SOAP proxies (and future OpenAPI proxies)
• Property IshTypeFieldSetup, so the CardType vs Field vs LoV relationships... Note that this can be done already today using Get-IshTypeFieldDefinition
• Property UserName, so retrieve field USERNAME again
• Property UserLanguage, so retrieve field FISHUSERLANGUAGE again
• Property ServerVersion
• Property AuthenticationContext
• Property AccessToken (on future Modern Authentication)

Note: based on an automation challenge, took the effort to think about this, consider this the meeting minutes :) ... actually the most important scenario is covered through already released Get-IshTypeFieldDefinition