Add ChangeUnitConstructor annotation to allow mongock to pick constructors for dependency injection

[thekaleidoscope]

Issue reference

508

Documentation PR reference

38

Description and context

Used Optionals and Stream for null safe iterations

Benefits

[What benefits will be realized by the code change?]

Improve existing exceptions, add ability to specify which constructor to inject dependencies to.

Possible Drawbacks

[What are the possible side-effects or negative impacts of the code change?]

None I can think of.

Checklist

• Unit tests provided
• Integration tests provided
• Documentation updated in documentation project
• Updated example in example projects // can't find use of constructor there

[dieppa]

We'll take a look today ;).

Thanks

[dieppa]

Thanks! looks good, just a couple of minor changes before merging 😃

[osantana85]

@thekaleidoscope we have approved this PR, so now you can merge it. Thanks for collaborating with Mongock!

[thekaleidoscope]

@osantana85 Thanks, I don't see how to do it though, It says Only those with [write access](https://docs.github.com/articles/what-are-the-different-access-permissions) to this repository can merge pull requests. In the past I saw @dieppa had merged the MRs

[osantana85]

@thekaleidoscope Ok, no problem, it's just about permissions. I'll merge it. Thanks.