Add prevalent middlewares

[sevein]

This pull request introduces the middleware package, which includes a few HTTP handlers (similar to https://github.com/gorilla/handlers) that are commonly used across our projects:

• middleware.Recover
• middleware.VersionHeader
• middleware.WriteTimeout

Seen in:

• https://github.com/artefactual-labs/enduro/blob/main/internal/api/middleware.go
• https://github.com/artefactual-sdps/enduro/blob/main/internal/api/middleware.go
• Private projects

In further PRs:

• Investigate replacement of goahttpmwr.RequestID() (deprecated)
• Investigate replacement of goahttpmwr.Log() (deprecated)

[djjuhasz]

Yeah, looks okay to me, but the details are all way beyond my knowledge of how http handlers work in Go. 🤷