[bisq-network/bisq] Improve BSQ block requests (#3094)

[Florian Reimair]

> Currently we request BSQ blocks from only one seed node.

it is quite hard to change that behavior, because we only request "from blockheight" (without "until blockheight"). So if we query multiple seednodes at the same time, we create a much higher network load

> If it fails there is a rather long timeout 

This is what I found until now (for documentation purposes):
if the first attempt fails, the retry timer engages. there are different possible outcomes:
- if the desired connection already exists
   - everything works as expected -> rarely
   - although we get the data we asked for, the retry timer keeps on going -> more often
- a new connection has to be created
   - it tends to not have the required capabilities


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