[KYUUBI #830] Add umbrella type issus template

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### _Why are the changes needed?_
<!--
Please clarify why the changes are needed. For instance,
  1. If you add a feature, you can talk about the use case of it.
  2. If you fix a bug, you can clarify why it is a bug.
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Make issue easy to manage.

### _How was this patch tested?_
 https://github.com/ulysses-you/incubator-kyuubi/issues/1

![image](https://user-images.githubusercontent.com/12025282/126117336-05c1a848-bc25-4906-9bfa-5b6e8fc457c4.png)

![image](https://user-images.githubusercontent.com/12025282/126117524-192e2a6f-5676-4507-a32f-10872e9172f8.png)

Closes #830 from ulysses-you/umbrella.

Closes #830

01b9bf78 [ulysses-you] nit
a834e0cf [ulysses-you] fix
4e60dca6 [ulysses-you] umbrella

Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: ulysses-you <ulyssesyou18@gmail.com>

.github/ISSUE_TEMPLATE/umbrella.md

@@ -0,0 +1,26 @@
+---
+name: Umbrella
+about: An umbrella issue that contains several sub-tasks
+
+---
+
+# Describe the proposal
+<!--
+A clear and concise description of what the proposal is.
+If this is a KPIP https://kyuubi.apache.org/improvement-proposals.html, please put related link here.
+-->
+
+
+# Task list
+<!--
+Several sub-tasks with the pre-create issues, and it's better to @ the assignees if you know.
+More details can see github docs https://docs.github.com/en/issues/tracking-your-work-with-issues/about-task-lists.
+A simple example:
+
+- [ ] #1
+  - [ ] #11 @user1
+  - [ ] #12
+  - [ ] #13
+- [ ] #2 @user2
+- [ ] #3
+-->