[Call for reviewers] Switch `text`'s internal representation to UTF-8

[Hécate]

Hello everyone,

After tremendous efforts, the pull request to switch `text`'s internal 
representation to UTF-8 is here, and unsurprisingly this is a titan's work.

It lives here: https://github.com/haskell/text/pull/365

We are sending out a call for reviewers, as this is a cornerstone of our 
ecosystem. The performance gains from this PR are huge and I would like 
to ensure we can have a multitude of eyes to take a look.

I wish to express my thanks to all of you. This is definitely the kind 
of advances that will make Haskell a stronger language for the times to 
come.

Cheers,
Hécate.

-- 
Hécate ✨
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