Rename configs with defintions to `definitions-*`

[vjik]

common → definitions web → definitions-web console → definitions-console

This is will be more consistently with events, bootstrap, providers, routes and etc.

[samdark]

Good thing is that the prefix will be the same so files will appear grouped. Bad thing is that it looks more complicated.

[vjik]

Seems, variant with definitions more simplify:

definitions/*.php
definitions-web/*.php
definitions-console/*.php
bootstrap.php
bootstrap-web.php
bootstrap-console.php
events.php
events-web
events-console.php
params.php
providers.php
providers-web.php
providers-console.php
routes-backend.php
routes.php

VS

common/*.php
console/*.php
web/*.php
bootstrap.php
bootstrap-web.php
bootstrap-console.php
events.php
events-web.php
events-console.php
params.php
providers.php
providers-web.php
providers-console.php
routes-backend.php
routes.php

[samdark]

Related to https://github.com/yiisoft/demo/pull/345