Auto add a label depending on the type of issue they report.

Reviewed-by: Richard Levitte <levitte@openssl.org>
GH: #9319

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,5 +1,6 @@
 ---
 name: Bug report
+labels: bug
 about: Report a defect in the software
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,5 +1,6 @@
 ---
 name: Feature request
+labels: feature
 about: Propose a feature you would like to see added in the software
 
 ---