Organize typescript imports as a fixer.

Hello!

I've been wondering if it's possible to use `ale#organize_imports#Execute` as a fixer so it's possible to organize imports and format code with a single command.

I've tried running it with ALEFixPost/Pre autocommands but it either messes up the imports or leaves some code unformatted.

Here's the fixer implementation I tried to use but I'm quite new to vimscript so I'm not sure if it's possible to wait until after it's finished to run other fixers.

```vimscript
function! ale#fixers#tsserver_organize_imports#Fix(buffer) abort
return {
\ 'command': ale#organize_imports#Execute(),
\ 'read_temporary_file': 1,
\}
endfunction
```