Document all changes w.r.t. previous release in change log

[cristianoc]

What are the changes, whether they are breaking, workarounds etc.

Here's a partial list of changes that need to be documented in the release notes:

• Format module removed including the type and all similar printing functions
• open_in and close_in seem gone, what else is?
• @bs.send.pipe is now removed, before it was deprecated.
• Missing labels in function application is now an error (https://forum.rescript-lang.org/t/ann-more-strict-checks-in-missed-labels/2117).
• Doc comments /** ... */ are now attached to attributes, so are only valid at position where @foo is, or a syntax error is issued.
• Anything that needed to change in this PR to make it compile Make the example project compilable with compiler version 10.0. rescript-vscode#465
• Anything that changed in the compiler output: Changes in compiler output with 10.0. rescript-vscode#466
• New/removed files in npm package as per the artifacts.json changes in 0fd8bb0

[cristianoc]

In release notes.