Remaining to-dos for version 4:

- [x] More test coverage
- [x] Alternative for schema directive visitor (add custom directives after creating federated schema)
- [x] Document transforms, including directives
- [x] Fix context injection
- [x] IGraphQLComponentConfigObject documentation 
- [x] Fix composition examples
- [x] Fix federations examples
- [ ] Revert composition examples to JS again
- [x] Update readme
  - [x] Repository structure
  - [x] API
  - [x] Component options
  - [x] Imports / excludes docs reference to SubschemaConfig
- [ ] Move to latest stitch functionality in @graphql-tools/stitch (big change)