* handle RemoveKeys command in ScanTask
* implements DeleteKeys request
* uses spawn_blocking and updates comments
* removes spawn_init fn
* adds test for new Storage method
* adds fake_sapling_results helper function
* adds test for scan service DeleteKeys request
* adds TODO for unwrap_or_clone
* checks the keys sent to the scan task for removal
* moves message processing to its own function
* adds a timeout for the scanner task response
* hide mock() methods behind cfg(test) or feature
* adds MAX_REQUEST_KEYS constant
* updates test to insert and delete results for a second key
* Update zebra-scan/src/init.rs
Co-authored-by: Alfredo Garcia <oxarbitrage@gmail.com>
* test that the expected number of results are in the db
* fix unused import lint
* fixes unused imports
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Co-authored-by: Alfredo Garcia <oxarbitrage@gmail.com>
Arya