stdio jsonrpc server npm package

[Simon-Laux]

• figgure out how to build the packages (that it installs native optional package automatically)
• Make the gluecode
  • expose both the lowerlevel api that desktop uses (send objects and receive objects, getting path of rpc-server is enough)
  • and the higher level api needed for bots (jsonrpc client)
  • typescript types
  • automatically pick the right binary from npm or allow getting it from env var, or give out an error (throw error)
  • find out how to dev locally (use local built core in dc desktop) - there is the question of how to link the typescript client and the task to add a search in the cargo target folder for a debug build or a different way, find out some good flow that we can use and document for dc desktop + locally built core development
• build the packages in ci
• fix that deltachat-rpc-server is not executable

postponed:

• publish from ci
  • add key/token to deploy to npm

Closes #4694

Related prs

• add nodejs jsonrpc over stdio with @deltachat/stdio-rpc-server deltachat-bot/echo#69
• use stdio binary instead of dc node & update electron to 30 & update min node to 20 deltachat-desktop#3567

[link2xt]

I removed rustup as a dependency for printing targets. cargo already reports a nice error suggesting rustc --print target-list when the target is not available.