[main] Update version to 49.0.0, add 49.0.0 changelog - #16855

[main] Update version to 49.0.0, add 49.0.0 changelog#16855

alamb merged 4 commits into

apache:mainapache/datafusion:mainfrom

alamb:alamb/forward_port_49_changesalamb/datafusion:alamb/forward_port_49_changesCopy head branch name to clipboard