feat: add Controller::validateData()

[kenjis]

Description

• $this->validate() can't validate arbitrary data
  • e.g. method parameters, trimmed data
• This method can validate any user supplied data

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

This seems a bit unnecessary to me as it just saves a step over using the Validation Service, but if you think it would be beneficial it does synergize nicely with validate() so I'm not opposed.

[kenjis]

Added method param, documentation.