Add code architecture check tooling

[adamzimmermann]

Description

Explore using nunomaduro/phpinsights for code architecture checks.

Proposed Solution

Check this tooling out and see if we find it valuable.

Alternatives Considered

Decide to not use this tool.

Additional Context

We explored using this tool before, but we never implemented it.

The following issues were previously blocking this along with a drush/drush version constraint on Robo that was recently removed.

• league/container 2.x is unmaintained and throws warnings on composer install consolidation/robo#935
• Remove deprecated dependency & bump coding standard package nunomaduro/phpinsights#477