Allow wrangler to be run in subdirectories

[EverlastingBugstopper]

We should walk up the directory structure looking for a wrangler.toml so that you can run wrangler commands in subdirectories.

This issue brought to you by a PR doing this in wasm-pack

[ashleymichal]

related: #860

[exvuma]

How would we consider multiple wrangler.toml's in different subdirectories(sub/wrangler.toml and sub2/wrangler.toml )? What if you want multiple wrangler.toml (wrangler-api.toml ) files in one directory?

Both concerns would be addressed if we follow what webpack does and allow a flag to be passed in. To make convenient I put my wrangler commands in my package.json. In this case it'd look like

"scripts": {
  "deploy": "wrangler --config sub/wrangler.toml publish"
}

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