ESP radio improvements

[tact1m4n3]

• osi layer task deletion
  Currently, tasks spawned by the osi layer can exit but the memory is never freed. Right now, this isn't a problem if one does not init and deinit the wifi driver multiple times.
  A possible solution would be to create a new low priority task that receives other tasks via a queue and calls rtos.wait_and_free on each.
• esp wifi: remaining zig wrappers
  There is still some functionality that we don't have zig wrappers for.
• esp now
• bluetooth
  For a reference implementation, you can look at esp-idf or the rust esp-radio crate.
• move radio and rtos out of the hal and into a new package that also provides an std.Io implementation (big TODO for the future)