Named Arguments in Aliases for Auto Completion

[cmprmsd]

Is your feature request related to a problem? Please describe.
When working with dotnet tooling as Sliver aliases I sometimes miss auto completion as it is available for extensions.

Describe the solution you'd like
Currently there is already an argument definition for extensions implemented in Sliver. However, this does not apply to aliases.

Example:

"arguments": [
    {
      "name": "target",
      "desc": "target host",
      "type": "string",
      "optional": false
    }
  ]

It would be great to have autocompletion on the execute-assembly itself first and on the defined arguments, when the user typed "--" to end the arguments for execute-assembly itself.

Additional context
I know 1.6 is already feature creeped with 1300 commits since the last release, so this might be an idea for next year. 😁
Btw, does the command history work correct for you on the latest master? When I press up often the command line is empty or only a partial command is loaded from my history.