ability to convert high-level Cadl spec into a common level such as Http

[tjprescott]

During the review on 8/16, the architects expressed a strong desire for transpilation into a more basic level such as the Http or Rest layer, with all spreads expanded. They had concerns regarding the ability to understand all the templates and types, particularly those defined by the service team, and want something that is a pure apples-to-apples comparison. They want to see the Cadl representation that is as close to the Http or Rest layer instead of relying on "mental compilation" of highly abstracted Cadl.

[markcowl]

pri: 1

[markcowl]

• set up design discussion with architects/ review board

[tjprescott]

@timotheeguerin was already working on this here:
#1465

[markcowl]

• link to existing design issues on displaying template meaning and close