Tab completion for unsupported commands should default to shell

[neelmehta247]

Describe the bug

For commands like kubectl that aren't natively supported by Warp, the tab completion should defer to the shell completion.

When running in a normal terminal emulator running something like kubectl <tab> will give a list of supported operations and even stuff like kubectl describe pod <tab> will show a list of pods.

With Warp this doesn't happen and instead, it just shows a list of files in the working directory. This is super annoying and makes it very hard to use. I find myself having to switch between 2 terminals because of this.

I've also noticed this happen with other commands like Skaffold. I think it would be unreasonable to expect native support for every command, but having a way to fall back to Shell completion would be nice.

To Reproduce

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Expected behaviour

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Screenshots

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Operating System

MacOS

OS Version

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Additional context

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[elviskahoro]

@neelmehta247
Can you move this to here:

• Supporting shell completions (spec) #434
  This is where we're discussing this! Closing for now