Add 'isInitializing' property so we're able to detect init() was already called.

[koenvd]

🚀 Feature Proposal

I understood from different other issues we should not call the init function of the service twice.

However it would be nice the service would have an isInitializing property indicating init() was called and is not yet finished (what the isInitialized property is telling us).

We can then use that property to decide if we no longer are allowed to call the init method but just have to wait instead on the initialized event to detect when the service finished intializing.

Motivation

There's still some time between calling init and the service becoming initialized. In that time interval an isInitializing property would help to know we no longer can call init.

Now we need to keep track of this ourself outside this service which is a bit painful.

[adrai]

Feel free to suggest a PR

[adrai]

included in v23.10.0

[koenvd]

Waw. Awesome @adrai !! Thanks for the fix.

[adrai]

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