Consider having some apio commands working on multiple envs in a single invocation.

[zapta]

Recently we added to apio.ini support for multiple envs and the relevant commands such as apio build, apio test and apio lint got a new --env flag that allows to select the env to use.

This issue is for considering adding to applicable apio commands the ability to work on multiple envs in a single invocation. For example, apio test or apio lint which run on all or a preconfigured subset of the envs and tests and lints them.

Motivation:
Since different envs can have different verilog macros defines in them, it's possible that one env will pass the test or lint but will fail on another.