feat: propagation watch and debug header #1061
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This PR introduces two things:
1 - An automatic header in the response phase, including a deployment ID; this helps debug projects that use caching in some way.

2 - A pooling observing the propagation of the first deploy (status != 404). It displays a message showing the edges while the project has not yet propagated.
watch.mp4
One detail: we do not use the prefix as
deploy-version
, because it refers to the storage. In the future, a user may want to make a change in computable code, but use a different version of the same storage. Perhaps, in the future it will be necessary to change the prefix tostorage-version
or something like that.