Modify issue templates to automatically attach labels (feast-dev#2205)

Signed-off-by: Danny Chiao <[email protected]>

Author: adchia

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ''
-labels: ''
+labels: 'kind/bug'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: ''
+labels: 'kind/feature'
 assignees: ''
 
 ---