Refactor Shelley Insert.hs

[Cmdv]

Description

Refactoring /Cardano/DbSync/Era/Shelley/Insert.hs into smaller modules.

Checklist

• Commit sequence broadly makes sense
• Commits have useful messages
• New tests are added if needed and existing tests are updated
• Any changes are noted in the changelog
• Code is formatted with fourmolu on version 0.10.1.0 (which can be run with scripts/fourmolize.sh)
• Self-reviewed the diff

Migrations

• The pr causes a breaking change of type a,b or c
• If there is a breaking change, the pr includes a database migration and/or a fix process for old values, so that upgrade is possible
• Resyncing and running the migrations provided will result in the same database semantically

If there is a breaking change, especially a big one, please add a justification here. Please elaborate
more what the migration achieves, what it cannot achieve or why a migration is not possible.

[sgillespie]

This is a massive improvement. However, I wonder if we need the Insert/*.hs nesting. Everything in Era/Shelley is inserting so I think we could probably flatten that out a bit.

EDIT: After further review, there's lots of stuff that does not do inserting that I didn't see last week. I'm back to liking the Insert/X.hs nesting

[sgillespie]

LGTM