feat(generate): first attempt at getting tutone to generate types

[sanderblue]

Still lots of work to be done, but makin' moves here.

Future work (#11):

• One config file
• POC of using a "provider" pattern (keep business logic separate from program logic)

To test it out

1. Create a .tutone.yml and .generate.yml config file in the project root
2. Compile the tutone binary with make compile-only
3. Run ./bin/darwin/tutone generate -c .tutone.yml -d .generate.yml -l debug

.tutone.yml

---
# Log level for running tutone
# Default: info
log_level: debug

# File to store a copy of the schema
# Default: schema.json
schema_file: schema.json

# GraphQL endpoint to query for schema
# Required
endpoint: https://api.newrelic.com/graphql

# How to authenticate to the API
auth:
  # Header set with the API key for authentication
  # Default: Api-Key
  header: Api-Key

  # Environment variable to get the API key from
  # Default: TUTONE_API_KEY
  api-key-env: NEW_RELIC_API_KEY

generate:
  # Name of the file within a package to write types
  # Default: types.go
  types_file: types.go

.generate.yml

---
packages:
  - name: alerts
    path: pkg/alerts
    types:
      - name: AlertsMutingRuleConditionInput
      # ... add more types as needed

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