[Bug] Rename MsalMemoryTokenCacheOptions.SlidingExpiration to AbsoluteExpirationRelativeToNow #250

Which Version of Microsoft Identity Web are you using ?
Microsoft Identity Web 0.1.5-preview

Where is the issue?

• Web App
  • Sign-in users
  • Sign-in users and call web APIs
• Web API
  • Protected web APIs (Validating tokens)
  • Protected web APIs (Validating scopes)
  • Protected web APIs call downstream web APIs
• Token cache serialization
  • [x ] In Memory caches
  • Session caches
  • Distributed caches

Repro
MsalMemoryTokenCacheOptions.SlidingExpiration should be named AbsoluteExpirationRelativeToNow

MsalMemoryTokenCacheProvider.cs#L80

whereas the In memory cache uses absoluteExpirationRelativeToNow