feat: Add Proposal Edit and Raw pages

[victorgcramos]

This PR adds the Proposal Edit and Proposal Raw pages.

Part of #2875

While implementing this, I noticed that the logic used to fetch proposal
details, on Details (record/:token) page, was being affected by the
proposal details fetch on Edit (record/:token/edit) page. Since we have
already fetched it on another page, other listeners such as voteSummaries,
comments, piSummaries, weren't triggered.

One way to quick fix that was to force a request on every page load on
both details and edit pages. This, of course isn't a correct design in terms
of cache and navigation delays, but since it's out of this PR scope, I
decided to go for this quick fix.

• Proposal Edit page: /record/:token/edit,
• Proposal Raw page: /record/:token/raw.

[tiagoalvesdulce]

Raw page shouldn't be stylized.

How it is:

How it should be (matching production):

:

[tiagoalvesdulce]

LGTM