Package `deltachat-rpc-server` releases as .tar.gz

[link2xt]

Releases have deltachat-rpc-server binaries now, but they are not packed into .tar.gz (Linux) or .zip (Windows): https://github.com/deltachat/deltachat-core-rust/releases/tag/v1.112.0

The binaries are automatically uploaded by this workflow: https://github.com/deltachat/deltachat-core-rust/blob/7add1c116c7f29323a015eac87e49ab6f6bdf0c4/.github/workflows/deltachat-rpc-server.yml

Linux users now have to download the correct binary, rename it into deltachat-rpc-server and set the +x flag. To skip renaming and setting permissions, it is better to package the binary with a correct name and permissions into .tar.gz archive.

For Windows the correct name is likely deltachat-rpc-server.exe on both platforms, and the binary should be packed into .zip.

[adbenitez]

I think we can close this issue, with the deltachat-rpc-server binary released as a python package that makes already much easier to use than manually downloading a compressed archive because it also gets added to the path

cc @link2xt