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Prepare 2.0.0 release and engine-upgrade migration notes #39

Job	Run time
build-engine-wheels (macos-latest, osx-x64 osx-arm64)	1m 58s
build-core	13s
build-engine-wheels (ubuntu-latest, linux-x64 linux-arm64)	2m 9s
test (windows-latest, 3.12)	3m 2s
test (ubuntu-latest, 3.9)	1m 49s
test (ubuntu-latest, 3.12)	1m 43s
build-engine-wheels (windows-latest, win-x64 win-arm64)	3m 3s
test (macos-latest, 3.12)	1m 42s
test (windows-latest, 3.9)	3m 45s
test (windows-latest, 3.11)	3m 16s
test (ubuntu-latest, 3.11)	1m 46s
test (macos-latest, 3.11)	2m 2s
test (macos-latest, 3.9)	2m 2s
	28m 30s