Fully switch from Calispel to Lparallel

[Ambrevar]

In #2998 it was highlighted that Calispel use is still hindering us and we would benefit from switching to Lparallel:

• Better API (futures, promises, kernel, etc.)
• Less risk of dangling threads.
• Possibly better performance.
• No more need for with-protect.

To do:

• Remove Calispel submodule and it's dependencies (jpl-queue and jpl-util I think).
• Remove make-channel.
• Replace manual channel use by promises and futures.
• Remove run-thread.
• Rename Lparallel kernel.
• Store / bind Lparallel kernel in *browser*? This way we can clean it up when exiting in the REPL.