docs: new GitHub Issue templates

[IgorMinar]

These templates take advatange of github's feature that allows
us to define multiple templates and which the UI presents to the
user and lets them choose the most appropriate template.

The goal of this is to tailor the templates to the templates to
various use-cases and bug categories and provide better guidance to
developers filing issues which should result in more efficient
processing of the issue backlog.

You can view the demo of this change at: https://github.com/IgorMinar/angular/issues/new/choose

[kara]

LGTM, just some typos

[kara]

@IgorMinar Apply merge label when ready

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of all the commit author(s), set the cla label to yes (if enabled on your project), and then merge this pull request when appropriate.

[googlebot]

A Googler has manually verified that the CLAs look good.

(Googler, please make sure the reason for overriding the CLA status is clearly documented in these comments.)

[IgorMinar]

@kara thanks for all the fixes!!

[IgorMinar]

caretaker note: this pr has no impact on ci except for the lint job, so the failures are unrelated.

[googlebot]

CLAs look good, thanks!

[angular-automatic-lock-bot]

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