All symbols are optional

[tylerjwatson]

All symbols in these typings are optional, making concrete implementations of these object an unnecessarily huge task. Only fields marked as optional in the graph documentation should be marked as optional with the ?: specifier, all others should be declared as normal.

If the interface needs to be marked as optional, Partial<T> should be used instead.
AB#7043

[muthurathinam]

In particular the Entity type’s id and the createdDateTime and lastModifiedDateTime fields are now not nullable. This makes list creation in SharePoint problematic since those fields are server generated and shouldn’t be expected when you’re doing a POST to create a list or Column Definition (both of which derive from those base types).