feat(github): Mark new issues as 'to triage'

Signed-off-by: Sebastian Schuberth <[email protected]>

.github/ISSUE_TEMPLATE/bug.md

@@ -2,7 +2,7 @@
 name: Bug Report
 about: I want to report a bug that I am facing.
 title: ''
-labels: 'bug'
+labels: ['bug', 'to triage']
 
 ---
 ### Describe the bug

.github/ISSUE_TEMPLATE/enhancement.md

@@ -2,7 +2,7 @@
 name: Enhancement Proposal
 about: I want to propose to enhance existing functionality.
 title: ''
-labels: 'enhancement'
+labels: ['enhancement', 'to triage']
 
 ---
 ### What is the existing functionality and how should it be enhanced?

.github/ISSUE_TEMPLATE/feature.md

@@ -2,7 +2,7 @@
 name: Feature Request
 about: I want to request a new feature that I find useful.
 title: ''
-labels: 'new feature'
+labels: ['new feature', 'to triage']
 
 ---
 ### What is the feature you want to request?