[OUDS] Update migration to permit users to filter and sort changelog entries

[MaxLardenois]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Suggestions:

• use a JSON file to store changelog information
• users should be able to sort and filter changelog entries (breaking first, info last etc.)
• changelog links should be inferred from version number

Motivation and context

We have much information on the migration page