Add icons to issue template

Author: rgsl888prabhu

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,5 +1,5 @@
 ---
-name: Bug report
+name: 🐛 Bug report
 about: Create a bug report to help us improve cuOpt
 title: "[BUG]"
 labels: "? - Needs Triage, bug"

.github/ISSUE_TEMPLATE/documentation-request.md

@@ -1,5 +1,5 @@
 ---
-name: Documentation request
+name: 📚 Documentation request
 about: Report incorrect or needed documentation
 title: "[DOC]"
 labels: "? - Needs Triage, doc"

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,5 +1,5 @@
 ---
-name: Feature request
+name: 🚀 Feature request
 about: Suggest an idea for cuOpt
 title: "[FEA]"
 labels: "? - Needs Triage, feature request"

.github/ISSUE_TEMPLATE/submit-question.md

@@ -1,5 +1,5 @@
 ---
-name: Submit question
+name: ❓ Submit question
 about: Ask a general question about cuOpt
 title: "[QST]"
 labels: "? - Needs Triage, question"