Add OnDataLoaded EventCallback

[behroozbc]

Summary of the changes (Less than 80 chars)

• Add OnDataLoaded EventCallback on UseQueryCompoent of blazor

I couldn’t test this because every time I tried to add it to my Blazor project, I got other errors that weren’t related at all.
But based on my experience, I think this is correct.
Please test it if possible.
Also, I couldn’t find UseQuery component tests and didn’t write them. If needed, please guide me.
Additionally, I have a complaint about CONTRIBUTING.md because the information is outdated!
Closes #8673

[CLAassistant]

All committers have signed the CLA.

[behroozbc]

I see @glen-84 you want to review this pull requests, how I can help you to this PR be merge sooner?

[michaelstaib]

We have put the PR on our internal backlog for discussion @glen-84 will review the actual issue and then we will see what design will fit to your issue.

[behroozbc]

I think this have be on another pull request.
I saw the use query and use subscription have many same things, I like to know why these two classes cannot inheritance from same class, for example componentbase-> UseBase class( this name must change)-> usequery, usesubscription.

[glen-84]

LGTM, I'm just waiting for @michaelstaib to comment on the testing aspect.

[michaelstaib]

I will create a preview this week and ping you once its available.