Enable sort-imports lint rule

Summary:
Changelog: Internal

Enables the `sort-imports` lint rule in the Metro repo, to align with other Meta repos. I will codemod all existing files to comply with the lint rule in a separate diff.

Reviewed By: robhogan

Differential Revision: D51946976

fbshipit-source-id: bb3cdac03928e388f8781fcd684183d4ef1baee0

scripts/eslint/base.js

@@ -30,6 +30,7 @@ module.exports = {
     'consistent-return': 'error',
     'import/no-extraneous-dependencies': 'error',
     'lint/extra-arrow-initializer': 'off',
+    'lint/sort-imports': 'warn',
     'lint/strictly-null': 'warn',
     'max-len': 'off',
     'no-alert': 'error',