Modernize GitHub templates (issues and PRs)

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug Report
+about: Report a bug in the Neo4j Python Driver
+labels: "bug"
+---
+
+<!--
+    If you are an Enterprise customer, you might want to head over to our
+    [Customer Support Portal](https://support.neo4j.com/).
+-->
+
+<!--
+    If you are unsure about the usage of the driver, this issue tracker is not
+    the right place to ask. Please use one of the following channels instead:
+
+    - Neo4j Online Community: https://community.neo4j.com/
+    - StackOverflow: https://stackoverflow.com/questions/tagged/neo4j+python
+    - Discord: https://discord.gg/neo4j
+    - Neo4j Support Portal if you are an enterprise customer:
+      https://support.neo4j.com/
+
+    or check the documentation:
+
+    - API documentation: https://neo4j.com/docs/api/python-driver/current/
+    - Driver manual: https://neo4j.com/docs/python-manual/current/
+-->
+
+<!--
+    Make sure you've searched the issue tracker for similar issues first.
+-->
+
+
+# Bug Report
+<!-- description of the found bug -->
+
+<!--
+    Information to include:
+
+    Often, driver debug logs go a long way.
+    See https://neo4j.com/docs/api/python-driver/current/api.html#logging on
+    how to enable them.
+
+    Also, **full** stacktraces are very helpful if Exceptions are involved.
+
+    A minimal reproducer if possible
+    https://stackoverflow.com/help/minimal-reproducible-example
+-->
+
+
+# My Environment
+Python Version: <!-- output of `python -VV` -->
+Driver Version: <!-- can be found with `python -m pip show neo4j` -->
+Server Version and Edition: <!-- e.g., Neo4j 4.4.3 enterprise cluster -->
+Operating System: <!-- e.g., Windows 10, Ubuntu 18.04, macOS 10.15 -->

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature Request
+about: Suggest an idea for the Neo4j Python Driver
+labels: "feature request"
+---
+
+# Feature Request
+<!-- a brief description of what's requested -->
+
+# Pitch
+<!-- elaborate on the feature request and why it would be beneficial -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+    Thanks for making the effort to create a Pull Request!
+    Please read the comment in its entirety fist.
+
+    If you haven't already, please sign our Contributor License Agreement at
+    https://neo4j.com/developer/cla/
+    Commits from accounts that have not signed the CLA will fail the CI and
+    will not be reviewed. If you are a first-time contributor and have just
+    signed the CLA, please include a note about this in the PR comment as some
+    manual steps from our side are required.
+-->
+
+<!--
+    Title:
+
+    PRs targeting the current default branch (nightly driver) don't follow a
+    fixed naming scheme.
+
+    If your PR is a backport, please use the following naming scheme:
+
+    [targeted version] description
+
+    e.g.,
+
+    [4.4] Remove a banana from the code
+-->
+
+<!--
+    Description:
+
+    Please include a summary of the changes in this PR and their purpose.
+    Link any related issues or PRs.
+-->