fix(addons-v5): migrate addons-v5 package to OCLIF/core (#2116)

* fix(addons-v5): migrate addons-v5 package to OCLIF/core
- add oclif/core dependency
- remove oclif/dev-cli and oclif/plugin-legacy dependencies
- replace oclif/config with oclif/core in create.js test file

* fix yarn.lock file

Co-authored-by: Katy Bowman <katybowman@salesforce.com>

packages/addons-v5/package.json

@@ -14,13 +14,12 @@
     "repositoryPrefix": "<%- repo %>/blob/v<%- version %>/packages/addons-v5/<%- commandPath %>"
   },
   "dependencies": {
+    "@oclif/core": "^1.20.2",
     "heroku-cli-util": "^8.0.11",
     "lodash": "^4.17.11",
     "printf": "0.6.1"
   },
   "devDependencies": {
-    "@heroku-cli/dev-cli": "^1.26.13",
-    "@oclif/plugin-legacy": "^1.2.0",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "lolex": "^3.1.0",

packages/addons-v5/test/commands/addons/create.js

@@ -5,7 +5,7 @@ const cmd = commands.find(c => c.topic === 'addons' && c.command === 'create')
 const { expect } = require('chai')
 const lolex = require('lolex')
 const _ = require('lodash')
-const Config = require('@oclif/config')
+const { Config } = require('@oclif/core')
 const sinon = require('sinon')
 let config