issue templates to steer the public elsewhere (#994)

Co-authored-by: Steven R. Loomis <[email protected]>

Author: markusicu

.github/ISSUE_TEMPLATE/unicodedata.md

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+---
+name: Feedback on Unicode data, properties, algorithms
+about: Not for reporting bugs or suggestions
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Members of UTC/PAG and other Unicoders with access
+Please submit an issue in the Unicode-internal PAG repo.
+
+## Otherwise
+Please submit feedback via https://www.unicode.org/reporting.html

.github/ISSUE_TEMPLATE/unicodetools.md

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+---
+name: Feedback on the internal Unicode Tools code and processes
+about: Internal tools used by UTC/PAG
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+(Bugs, suggestions, ideas for internal Unicode Tools code, for its maintainers, their processes, etc.)
+
+(These tools are public and open source but not public deliverables. They are used internally by Unicode maintainers.
+Data is published at https://www.unicode.org/Public/ -- feedback: https://www.unicode.org/reporting.html)