Allow to display password input content when entering new bank access

We could ad a clickable eye icon so that it is possible for the user to check his password before submiting the form. The password shall be displayed only when the click is maintained on the eye icon.

When generating the banks.json is generated automatically, there could be more than just passwords to have a input type = password, as some field are declared in the module as being "masked" (and translated as an input type = password in kresus client)