Add changelog 45.0.0

Author: timsaucer

dev/changelog/45.0.0.md

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+
+# Apache DataFusion Python 45.0.0 Changelog
+
+This release consists of 2 commits from 2 contributors. See credits at the end of this changelog for more information.
+
+**Fixed bugs:**
+
+- fix: add to_timestamp_nanos [#1020](https://github.com/apache/datafusion-python/pull/1020) (chenkovsky)
+
+**Other:**
+
+- Chore/upgrade datafusion 45 [#1010](https://github.com/apache/datafusion-python/pull/1010) (kevinjqliu)
+
+## Credits
+
+Thank you to everyone who contributed to this release. Here is a breakdown of commits (PRs merged) per contributor.
+
+```
+     1	Kevin Liu
+     1	Tim Saucer
+```
+
+Thank you also to everyone who contributed in other ways such as filing issues, reviewing PRs, and providing feedback on this release.
+