Adds a changelog, a PR template, and config for the Codium PR agent

.github/pull_request_template.md

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+# Description
+
+> **Note**
+>
+> Please provide a description of the work completed in this PR
+>
+>
+
+## Type of Change
+
+- [ ] New feature
+- [ ] Bug fix
+- [ ] Breaking change
+- [ ] Project configuration change
+
+## Complexity
+
+> **Note**
+>
+> Please provide an estimated complexity of this PR of either Low, Medium or High
+>
+>
+
+## How Has This Been Tested?
+
+- [ ] Unit tests
+- [ ] Integration tests
+- [ ] Manual tests
+
+## Checklist
+
+- [ ] Unit tests updated
+- [ ] Integration tests updated
+- [ ] CHANGELOG.md updated

CHANGELOG.md

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+# Changelog
+
+## Next
+
+## 0.1.0
+
+### Added
+
+- Migrated all Neo4j-related code, including tests and integration tests, from the LangChain Community package to this package.

pr_agent.toml

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+[pr_update_changelog]
+extra_instructions="""
+    The current date is unimportant for the output. Do not use the current date.
+
+    Instead, make a recommendation to the user based on this example:
+
+    ### Added
+    ...
+    ### Changed
+    ...
+    ### Fixed
+    ...
+"""