[DependencyInjection] added support for inlining Configurators
feature #9791 [DependencyInjection] added support for inlining Configurators (realityking)

This PR was merged into the 2.5-dev branch.

Discussion
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[DependencyInjection] added support for inlining Configurators

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This is one commit from #9432.

As mentioned in #3758 configurators can not be private (it's just ignored). This pull changes that and allows them to be inlined. It it also creates better code if a configurator is used multiple times for one service (i.e. to both inject it and configure the same service, or to configure multiple inlined services) but this should be very rare.

Commits
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4e9aa07 [DependencyInjection] added support for inlining Configurators