feat(warehouse): staging file schema consolidation

[achettyiitr]

Description

• Consolidation of staging files schema with the warehouse schema
  • Before
    • For consolidating staging files, we iterate over all the staging files and consolidate them with warehouse schema.
  • After
    • Now we consolidate all the staging files first.
    • Later it is then consolidated with the warehouse schema.
• Refactoring around the schema package.

Notion Ticket

https://www.notion.so/rudderstacks/Consolidation-staging-files-schema-846379613cae451dbb5154d5903310cf?pvs=4

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[fracasula]

This is returning an error for me, can you please check it out? I think the fetchSchemaFromWarehouse method takes the fetchSchemaRepo interface:

type fetchSchemaRepo interface {
	FetchSchema(warehouse model.Warehouse) (model.Schema, model.Schema, error)
}

Which as the warehouse parameter as the only parameter. The problem is that whManager is of type Manager which has:

type Manager interface {
	FetchSchema() (model.Schema, model.Schema, error)

No parameter there.