Define link approach to LA; include data exchanges required share links

[cliftonc]

User accesses and uses the learning application after the learning application checks entitlement

Data Exchange?	Entity at Source	Destination Entity	Type of Exchange	Responsibility for Transformation
Link to LA	Link	Link	Browser

Notes:

• Define what a link is, who owns the creation of it.
• Links not just to front door, but deep link to specific areas of content.
• How is this structure shared between the LA and LMS.
• What additional metadata needs to be in the link? e.g. entitlement related, link to IdP

[cliftonc]

This has been captured in part in the entitlements API; https://stichtingsem.stoplight.io/docs/sem-technology-prototype/reference/entitlements.v1.yaml

With a defaultUrl - work still outstanding on the exchange from LA to LMS to enable updating the link.