Add issue templates for UI (#2698)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: '🐛 Bug Report'
+about: Report a reproducible bug in a WebViewer version.
+title: '[Bug] '
+---
+
+<!-- First of all, thanks for reaching out and reporting any issues you have found. Your feedback is valuable to the development of WebViewer UI! -->
+<!-- If the issue can only be reproduced on a specific document, or you would need to share some company/personal information, then we recommend you use open a support ticket via https://www.pdftron.com/form/request/ -->
+
+**WebViewer version**
+
+**The current behavior**
+
+**The expected behavior**
+
+**Steps to reproduce**
+
+
+
+

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: PDFTron Tech Support
+    url: https://www.pdftron.com/form/request/
+    about: This is the recommended alternative for opening a Github issue. It helps us analyze tickets and we respond faster in general.
+  - name: PDFTron Professional Services Request
+    url: https://www.pdftron.com/form/professional-services/
+    about: Use this service if you have a feature request that is not currently on our roadmap but is crucial to your users and you want it to be implemented in a timely fashion.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: 'Feature Request'
+about: Request a feature that is missing in WebViewer.
+title: '[Feature Request] '
+---
+
+<!-- First of all, thanks for reaching out and reporting any issues you have found. Your feedback is valuable to the development of WebViewer UI! -->
+<!-- If this feature request is crucial to your development and is time sensitive, then we recommend you to use our professional service. See https://www.pdftron.com/form/professional-services/ for more information -->
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Why is this feature important to your users?**
+
+**Desired timeline**
+
+
+
+