Auth Strategies (#1257)

* auth strategies

* default to no auth

* rename base auth strategy

* rename base strategy cont.

* refactor auth strategy methods and LocalAuth

* activate old session options even if is falsy value

* move restartOnAuthFail to LegacyAuthStrategy option

* add link to guide item

* update example/shell

* types

.npmignore

@@ -12,6 +12,8 @@ yarn-debug.log*
 yarn-error.log*
 
 *session.json
+.wwebjs_auth/
+
 .env
 tools/
 tests/