* Fix fringe condition for `GetStorageRanges` message handler
why:
Receiving a proved empty range was not considered at all. This lead to
inconsistencies of the return value which led to subsequent errors.
* Update storage range bulk download
details;
Mainly re-org of storage queue processing in `storage_queue_helper.nim`
* Update logging variables/messages
* Update storage slots healing
details:
Mainly clean up after improved helper functions from the sources
`find_missing_nodes.nim` and `storage_queue_helper.nim`.
* Simplify account fetch
why:
To much fuss made tolerating some errors. There will be an overall
strategy implemented where the concert of download and healing function
is orchestrated.
* Add error resilience to the concert of download and healing.
why:
The idea is that a peer might stop serving snap/1 accounts and storage
slot downloads while still able to support fetching nodes for healing.
5e865edec0