github: add issue templates

I am getting tired of asking people for reproductions. Hopefully these
issue templates will help with that.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: An issue with the current behavior of the regex crate.
+title: ''
+labels: ''
+assignees: ''
+---
+
+
+#### What version of regex are you using?
+
+If it isn't the latest version, then please upgrade and check whether the bug
+is still present.
+
+#### Describe the bug at a high level.
+
+Give a brief description of the actual problem you're observing.
+
+#### What are the steps to reproduce the behavior?
+
+This section should almost always provide a COMPLETE Rust program that others
+can compile and run with Cargo. It should be as small as possible.
+
+If providing a small and simple reproduction is not easy, please explain why
+and the maintainers will help you figure out next steps.
+
+#### What is the actual behavior?
+
+If you provide a Rust program in the previous section, then this should be the
+output of that program.
+
+#### What is the expected behavior?
+
+What do you expect the output to be?

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Ask a question
+    about: |
+      You've come to seek help or want to discuss something related to ripgrep.
+    url: https://github.com/rust-lang/regex/discussions/new

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature
+title: ''
+labels: ''
+assignees: ''
+---
+
+
+#### Describe your feature request
+
+Please describe the behavior you want and the motivation. Please also provide
+examples of how the new feature would be used if your feature request were
+added.
+
+The best kind of feature request is one that proposes a concrete change to the
+API along with a sketch of the changes to the public API documentation.
+
+If you're not sure what to write here, then try imagining what the ideal
+documentation of your new feature would look like. Then try to write it.