feat: treat bare deno command with run arguments as deno run

[crowlKats]

removes the necessity for the run subcommand to run scripts

fixes #24493

[ry]

Tested it - looks great.

Update the deno help text to explain that without a subcommand it defaults to run.

Current text is

A modern JavaScript and TypeScript runtime

Docs: https://deno.land/manual@v1.45.5
Standard Library: https://jsr.io/@std
Modules: https://jsr.io/ https://deno.land/x/
Bugs: https://github.com/denoland/deno/issues


Deno by Example: https://docs.deno.com/examples
  Start the REPL:              deno
  Execute a script:            deno run https://examples.deno.land/hello-world.ts
  Evaluate code in the shell:  deno eval "console.log(30933 + 404)"

I think this could be instead

Deno: a modern JavaScript and TypeScript runtime

docs https://docs.deno.com 
standard library https://jsr.io/@std
bugs https://github.com/denoland/deno/issues

[bartlomieju]

LGTM 🪨