Issue Template: @grafana/ui component request (#25981)

* Add first draft of issue template

* Remove feature request line

* Update PR feedback

* Minor tweaks

* Update .github/ISSUE_TEMPLATE/4-grafana_ui_component.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Fix punctuation

Co-authored-by: Clarity-89 <homes89@ukr.net>
Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

.github/ISSUE_TEMPLATE/4-grafana_ui_component.md

+---
+name: '@grafana/ui component request'
+about: Suggest a component for the @grafana/ui package
+labels: 'area/grafana/ui'
+---
+
+<!-- 
+By using this template you will make it easier for us to make sure that documentation and implementation stays up to date for every component in @grafana/ui
+
+Thank you!
+-->
+
+**Why is this component needed**:
+<!-- Explain your use case -->
+___
+ - [ ] Is/could it be used in more than one place in Grafana?
+
+**Where is/could it be used?**:
+
+___
+- [ ] Post screenshots possible.
+- [ ] It has a single use case.
+- [ ] It is/could be used in multiple places.
+
+**Implementation** (Checklist meant for the person implementing the component)
+
+- [ ] Component has a story in Storybook.
+- [ ] Props and naming follows [our style guide](https://github.com/grafana/grafana/blob/master/contribute/style-guides/frontend.md).
+- [ ] It is extendable (rest props are spread, styles with className work, and so on).
+- [ ] Uses [theme for spacing, colors, and so on](https://github.com/grafana/grafana/blob/master/contribute/style-guides/themes.md).
+- [ ] Works with both light and dark theme.
+
+**Documentation**
+
+- [ ] Properties are documented.
+- [ ] Use cases are described.
+- [ ] Code examples for the different use cases.
+- [ ] Dos and don'ts.
+- [ ] Styling guidelines, specific color usage (if applicable).