Migrate ember simple auth to v2 addon

[BobrImperator]

TODO

• remove torii, it's deprecated and old. There are also efforts made in https://github.com/adopted-ember-addons/torii
• remove session-setu-method usage, previously i twas generated during build, but since mixins and initializers are going away, the dependency can be removed
• instruct build to alias ember-fetch to fetch

ERROR in ../../../../../../../../../../Users/bobrystoteles/Projects/oss/fork-ember-simple-auth/packages/ember-simple-auth/dist/authenticators/devise.js 3:0-26
Module not found: Error: Can't resolve 'fetch' in '/Users/bobrystoteles/Projects/oss/fork-ember-simple-auth/packages/ember-simple-auth/dist/authenticators'
 @ ./tests/unit/authenticators/devise-test.js 2:0-61 9:20-33 31:24-37 134:22-35
 @ ./assets/test.js 230:13-67

ERROR in ../../../../../../../../../../Users/bobrystoteles/Projects/oss/fork-ember-simple-auth/packages/ember-simple-auth/dist/authenticators/oauth2-password-grant.js 3:0-26
Module not found: Error: Can't resolve 'fetch' in '/Users/bobrystoteles/Projects/oss/fork-ember-simple-auth/packages/ember-simple-auth/dist/authenticators'
 @ ./tests/unit/authenticators/oauth2-password-grant-test.js 2:0-89 18:20-46 394:26-52
 @ ./assets/test.js 236:13-82

ERROR in ../../../../../../../../../../Users/bobrystoteles/Projects/oss/fork-ember-simple-auth/packages/ember-simple-auth/dist/configuration.js 1:0-79
Module not found: Error: Can't resolve 'ember-simple-auth/use-session-setup-method' in '/Users/bobrystoteles/Projects/oss/fork-ember-simple-auth/packages/ember-simple-auth/dist'
 @ ./tests/unit/initializers/setup-session-restoration-test.js 5:0-60 24:37-72 25:6-41 28:6-41 31:6-41 44:6-41
 @ ./assets/test.js 248:13-84

ERROR in ../../node_modules/torii/load-initializers.js 3:0-62
Module not found: Error: Can't resolve './initializers/initialize-torii' in '$TMPDIR/embroider/e962e9/node_modules/torii'
 @ ./assets/test-app.js 740:13-69

ERROR in ../../node_modules/torii/load-initializers.js 4:0-79
Module not found: Error: Can't resolve './initializers/initialize-torii-callback' in '$TMPDIR/embroider/e962e9/node_modules/torii'
 @ ./assets/test-app.js 740:13-69

ERROR in ../../node_modules/torii/load-initializers.js 5:0-77
Module not found: Error: Can't resolve './initializers/initialize-torii-session' in '$TMPDIR/embroider/e962e9/node_modules/torii'
 @ ./assets/test-app.js 740:13-69

ERROR in ../../node_modules/torii/load-initializers.js 6:0-63
Module not found: Error: Can't resolve './instance-initializers/setup-routes' in '$TMPDIR/embroider/e962e9/node_modules/torii'
 @ ./assets/test-app.js 740:13-69

ERROR in ../../node_modules/torii/load-initializers.js 7:0-67
Module not found: Error: Can't resolve './instance-initializers/walk-providers' in '$TMPDIR/embroider/e962e9/node_modules/torii'
 @ ./assets/test-app.js 740:13-69

[BobrImperator]

Closing in favor of #2604