Merge #19191: net: Extract download permission from noban

fa0540cd46 net: Extract download permission from noban (MarcoFalke)

Pull request description:

  It should be possible to grant nodes in a local network (e.g. home, university, enterprise, ...) permission to download blocks even after the maxuploadtarget is hit.

  Currently this is only possible by setting the `noban` permission, which has some adverse effects, especially if the peers can't be fully trusted.

  Fix this by extracting a `download` permission from `noban`.

ACKs for top commit:
  jonatack:
    ACK fa0540c
  Sjors:
    re-utACK fa0540cd46

Tree-SHA512: 255566baa43ae925d93f5d0a3aa66b475a556d1590f662a88278a4872f16a1a05739a6119ae48a293011868042e05cb264cffe5822a50fb80db7333bf44376d9

doc/reduce-traffic.md

@@ -23,7 +23,7 @@ longer serving historic blocks (blocks older than one week).
 Keep in mind that new nodes require other nodes that are willing to serve
 historic blocks.
 
-Peers with the `noban` permission will never be disconnected, although their traffic counts for
+Peers with the `download` permission will never be disconnected, although their traffic counts for
 calculating the target.
 
 ## 2. Disable "listening" (`-listen=0`)

doc/release-notes.md

@@ -102,6 +102,11 @@ Updated settings
 - The `-debug=db` logging category, which was deprecated in 0.20 and replaced by
   `-debug=walletdb` to distinguish it from `coindb`, has been removed. (#19202)
 
+- A `download` permission has been extracted from the `noban` permission. For
+  compatibility, `noban` implies the `download` permission, but this may change
+  in future releases. Refer to the help of the affected settings `-whitebind`
+  and `-whitelist` for more details. (#19191)
+
 Changes to Wallet or GUI related settings can be found in the GUI or Wallet  section below.
 
 New settings