Add links to official packages.

[lonnie-vault]

Adds links and descriptions about the official CodeIgniter packages for greater discoverability.

[kenjis]

What about https://github.com/codeigniter4/cache ?

[MGatner]

Cache... and DevKit, Tasks, Coding Standard?

[lonnie-vault]

Tasks doesn't have a release yet so I didn't include that one.

I had forgotten about Cache, honestly. I can try to squeeze some time in today to update, otherwise it won't be until late tonight, which would probably be too late to include.

[cijagani]

https://github.com/cijagani/awesome-codeigniter4

[kenjis]

Coding Standard and DevKit are packages for developing CI4.
It is not surprising if these are not on this page.

But it would be nice to have Cache.

[kenjis]

How about this?

*****
Cache
*****

`CodeIgniter Cache <https://github.com/codeigniter4/cache>`_ is a set of adapters
fully-compliant with `PSR-6 <https://www.php-fig.org/psr/psr-6/>`_ and
`PSR-16 <https://www.php-fig.org/psr/psr-16/>`_ to integrate with CodeIgniter 4's
:doc:`./caching`. This package is only for integrating third-party packages that
rely on the PSR interface provisions.

[lonnie-vault]

I managed to steal the last few minutes of my work day to add Cache, Devkit, and the Coding Standard. While I'm not sure they qualify as the type of packages I was originally thinking of, they can be beneficial to users, especially the devkit.

[MGatner]

Looks good! Few tweaks.