Syntax: "denox start" as option to "denox run start"

## Issue Type

- [ ] Bug Report
- [x] Feature Request
- [ ] Other

## Expected

Denox could run a denox option to create a better shorthand command.
The "run" word could be preserved. as optional
```bash
denox start
```
```bash
denox run start
```

## Actual

```bash
denox run start
```

## Possible Solutions

Could fork the project to start this feature.
BTW, Awesome Library! I was searching for something like this
## Info

- DenoX version:
denox/0.3.0 darwin-x86_64 deno-1.0.0

No file, test, or entry point is named in the issue. Start by locating the CLI command parsing for `denox run start`, then compare the behavior of `denox start` and `denox run start`; done means both commands invoke the same start operation.

Written by the indexing model from the issue text.