update to use new fancy issue templates (#2712)

.github/ISSUE_TEMPLATE/bug.md

@@ -1,3 +1,10 @@
+---
+name: Bug Report
+about: Create a report to help us improve
+labels: 'Type: Bug'
+
+---
+
 Please answer these questions before submitting your issue.
 
 ### What version of gRPC are you using?

.github/ISSUE_TEMPLATE/feature.md

@@ -0,0 +1,14 @@
+---
+name: Feature Request
+about: Suggest an idea for gRPC-Go
+labels: 'Type: Feature'
+
+---
+
+### Use case(s) - what problem will this feature solve?
+
+### Proposed Solution
+
+### Alternatives Considered
+
+### Additional Context

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,6 @@
+---
+name: Question
+about: Ask a question about gRPC-Go
+labels: 'Type: Question'
+
+---