purchases / com.revenuecat.purchases / Entitlement
class Entitlement : Parcelable
An entitlement represents features or content that a user is "entitled" to.
Entitlements are unlocked by having an active subscription or making a one-time purchase.
Many different products can unlock. Most subscription apps only have one entitlement,
unlocking all premium features. However, if you had two tiers of content such as premium and
premium_plus, you would have 2 entitlements. A common and simple setup example is one entitlement
with identifier pro, one offering monthly, with one product.
See this link for more info
Companion Object Functions