track gloss history

[arrocke]

• Add a GlossHistory model the prisma schema with the following schema:
  • wordId PK, FK
  • languageId PK, FK
  • timestamp PK
  • userId FK nullable
  • state nullable - if present, indicates that the gloss state changed
  • gloss nullable - if present, indicates that the gloss text changed
• Whenever the Gloss table is updated, we'll need to add an additional column to GlossHistory