Feature - Access request raw body

[rracariu]

Currently there is no way to work with mime types in requests that are not of the hard-coded types.

For example text has only this https://github.com/oakserver/oak/blob/master/request.ts#L26

A rawBody method would help future proof the API so it can used to read raw bytes.

Additionally providing a way to inject different text mime-types would also be good for the safe body method.

[kitsonk]

Fixed in a380e12

I did a couple of changes:

• If the content type does not map to Form, JSON, or Text, then request.body() will resolve with a type of "raw" and a value of Uint8Array.
• If you do request.body(true) and the it will resolve with type of "reader" and a value of Deno.Reader.
• If you supply app.bodyContentTypes, they will allow you to add additional media types which can be mapped to the Form, JSON, Text parsing of .body().