Bug 1817183 - Migrate most of services/fxaccounts to ES modules. r=markh

.eslintignore

browser/base/content/test/performance/browser_startup.js

services/fxaccounts/Credentials.sys.mjs

services/fxaccounts/FxAccounts.sys.mjs

services/fxaccounts/FxAccountsClient.sys.mjs

services/fxaccounts/FxAccountsCommands.sys.mjs

services/fxaccounts/FxAccountsConfig.sys.mjs

services/fxaccounts/FxAccountsDevice.sys.mjs

services/fxaccounts/FxAccountsKeys.sys.mjs

services/fxaccounts/FxAccountsPairing.sys.mjs

services/fxaccounts/FxAccountsPairingChannel.sys.mjs

services/fxaccounts/FxAccountsProfile.sys.mjs

services/fxaccounts/FxAccountsProfileClient.sys.mjs

services/fxaccounts/FxAccountsPush.sys.mjs

services/fxaccounts/FxAccountsStorage.sys.mjs

services/fxaccounts/FxAccountsTelemetry.sys.mjs

services/fxaccounts/FxAccountsWebChannel.sys.mjs

services/fxaccounts/components.conf

services/fxaccounts/moz.build