Sites support

[threepointone]

wrangler v2 has partial support for Workers Sites. This issue tracks the implementation.

• We need to do some work to make sure the hashes of the files generated when saving to KV are the same as wrangler v1, and we add all the validation that wrangler v1 has. fix: align publishing sites asset keys with Wrangler 1  #277
• We've added the ability to specify the directory for Sites in the cli, so for example you can do wrangler dev script.js --site path/to/assets (You can still specify it in wrangler.toml, of course).
• Error if asset is over 25Mb - 87cbf75
• Deprecate support for sites['entry-point'] configuration: you don't need that if you're explicitly passing the script. #282

[petebacondarwin]

First PR: #270

[petebacondarwin]

Second PR: #277

[petebacondarwin]

Third PR: #280