Split qualified TL entry name into namespace and name
Qualified TL entry name
Namespace (if any) and name
`splitNameToNamespace('messages.sendMessage') => ['messages', 'sendMessage']` Copy
`splitNameToNamespace('messages.sendMessage') => ['messages', 'sendMessage']`
`splitNameToNamespace('updatesTooLong') => [null, 'updatesTooLong']` Copy
`splitNameToNamespace('updatesTooLong') => [null, 'updatesTooLong']`
Split qualified TL entry name into namespace and name