Add issue templates for bugs, enhancements and questions

.github/ISSUE_TEMPLATE/ask-question.md

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+---
+name: "❓ Ask Question"
+about: Ask a question.
+labels: 'question'
+---
+
+<!-- 
+Please provide as many details as possible, so we can provide the best answer
+
+PS: Please verify that the question wasn't already answered in another GitHub issue
+-->

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: "🐞 Bug Report"
+about: Report a reproducible bug or regression.
+labels: 'bug'
+---
+
+<!--
+Please provide details of the problem, including the version of PL/Java that you
+are using. If possible, please provide a test case or sample application that reproduces
+the problem. This makes it much easier for us to diagnose the problem and to verify that
+we have fixed it.
+
+PS: Please verify that the bug is present in the latest release version, or if it was already reported
+in another GitHub issue
+-->

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: "🎁 Enhancement"
+about: Suggest an enhancement.
+labels: 'enhancement'
+---
+
+<!-- 
+Please start by describing the problem that you are trying to solve. There may already
+be a solution, or there may be a way to solve it that you hadn't considered.
+
+PS: Please verify that the enhancement/feature wasn't already suggested in another GitHub issue
+-->