[Twisted-Python] Enable pre-commit.ci for twisted/twisted

[Adi Roiban]

Hi,

As part of this PR https://github.com/twisted/twisted/pull/1619 Thomas has
requested to enable the https://pre-commit.ci  service for twisted/twisted
repository

The pre-commit.ci is kind of an auto-pilot for our pre-commit configuration.

We already do post-commit checks via the pre-commit framework and I think
that some of the core developers have pre-commit enabled as a git hook.

The convenience if pre-commit.ci is that if you don't have the git-hook
enable and you commit dirty code, pre-commit.ci will fix it for you.

pre-commit.ci will also automatically create PR to update the pre-commit
dependencies.

This all comes at the cost of allowing the external pre-commit.ci server to
write to twisted/twisted repository.

pre-commit.ci was already enabled for twisted/ldaptor

pre-commit.ci is currently enabled for twisted/twisted for testing while a
final decision is made.

I am +0 on this change due to security reasons...but I do think that it
will reduce a bit of the frustration for first time contributors.

If there are no strong comments against enabling pre-commit.ci, in a week,
I plan to approve the PR and have the pre-commit.ci enabled for the long
term.

We can always rewoke to pre-commit.ci write access if needed.

Cheers
-- 
Adi Roiban
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