insert and update restrictions

[VigneshSubramania91]

This is in reference to the PR #335.
The fix handles the update restrictions in addition to the changes proposed for insert restrictions with the above PR.

[HeikoTheissen]

If this PR is merged, #316 must be adapted.

[VigneshSubramania91]

@HeikoTheissen - I have removed the key and mandatory properties from required for update restrictions.
Could you please validate and merge if it looks okay.

[HeikoTheissen]

You can merge, but when RAP starts supporting InsertRestrictions/RequiredProperties targeting EntitySet/NavigationProperty or in Capabilities.NavigationRestrictions, this change is no longer sufficient.

[HeikoTheissen]

when RAP starts supporting InsertRestrictions/RequiredProperties targeting EntitySet/NavigationProperty or in Capabilities.NavigationRestrictions, this change is no longer sufficient.

RAP supports both patterns:

• Target=EntitySet, Annotation=Capabilities.NavigationRestrictions/.../InsertRestrictions
• Target=EntitySet/NavigationProperty, Annotation=Capabilities.InsertRestrictions

But not the combination of both:

• Target=EntitySet/NavigationProperty, Annotation=Capabilities.NavigationRestrictions/.../InsertRestrictions

Currently, RAP does not add the RequiredProperties properties to either of these patterns, but this may come later: FIORITECHE1-9372