Expressive IPSL Unixfs Requests

[Jorropo]

Add support for:

• unixfs.name (walk a directory component)
  • unixfs.hamt (internal walk of the HAMT state)
• unixfs.range (select a range in a file)

To the ipsl unixfs builtin.

(non authoritative ETA)
Eta: 2023-04-15

Children:

• Complete types in the IPSL compiler #15