Allow including external yaml files in .meshrc.yaml

[chompy18]

When using transforms, the .meshrc file gets really big and hard to follow.
Being able to break the meshrc into readable chunks .

Talking to @dotansimha over chat, he suggested:
I think we can eventually add it. YAML does support partials, but not from external files.
Maybe we can try to do that as part of our parsing process.

[ardatan]

Thanks for the suggestion!
@dotansimha This can be done on cosmiconfig side so other projects using cosmiconfig like graphql-config or graphql-codegen can support that.

[chompy18]

it would be great if we could:

serve: ./serve-config.yaml
transforms:
  - rename: ./rename-transforms.yaml
  - extend: ./extend-transforms.yaml
  - cache: ./cache-transforms.yaml

[ardatan]

This is implemented in the latest version but we haven't documented yet so you can include yaml files like;

serve: !include ./serve-config.yaml
transforms:
  - rename: !include./rename-transforms.yaml
  - extend: !include ./extend-transforms.yaml
  - cache: !include ./cache-transforms.yaml