Add draft of 0.19 changelog and release notes #13681

Job	Run time
docs-paths-filter	5s
cpp-paths-filter	4s
python-paths-filter	5s
rust-paths-filter	6s
web-paths-filter	8s
Checks / Lint markdown	16s
Checks / Rerun lints	25s
Checks / Check if running codegen would produce any changes	49s
Checks / Misc formatting	33s
Checks / Check links	18s
Checks / Spell Check	6s
Update PR Body / Update PR body	16s
C++ tests	0s
Python Checks / Python lints (ruff, mypy, …)	41s
Python Checks / Test Python Docs	33s
Deploy Landing Preview / Deploy	5s
Rust Checks	0s
Minimum CLI Build / Set Config (linux-x64)	2s
Build web viewer	0s
Build rerun_js	0s
Upload Web	0s
Save PR Summary	0s
Minimum CLI Build / Build rerun-cli (ubuntu-latest-16-cores)	46s
Minimum Wheel Build	0s
Minimum Wheel Test	0s
	5m 18s

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