Breaking changes for Bun 1.2

[Electroid]

This is a tracking issue for behaviour changes we want to introduce in Bun 1.2.

• Change Docker images to use non-baseline by default #12180

[paperdave]

should we consider #4464

[paperdave]

there are some existing breaking changes behind compile time feature flags. these can be inspected by doing a code search for breaking_changes_1_2

• websocket server: ws.subscribe() function will require a string argument
• bundler: --sourcemap without an argument is going to default to linked instead of inline
• bundler: imports marked external with a second argument will no longer hide that second value (this is done for some backwards compatibility that i want to remove)