Server SDK CHANGELOG.md file is created separately by the changelogger tool (#1513)

The affected target of a change (client, server, all) is shown in CHANGELOG.md

The meta tag for a change log entry in CHANGELOG.next.toml supports adding the affected target, as an example:
[smithy-rs]
...
meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "server" }
...

Possible values for target: [client, server, all]