fetch: make request timeout configurable (#5464)

## Motivation
After merging #5462, it might make sense to try and reduce request timeout, as the deadlines will no longer be hit due to long transfers

## Changes
Add `request-timeout` key to the `fetch` config. Also, fix a typo

CHANGELOG.md

@@ -78,9 +78,10 @@ configuration is as follows:
 
 ### Improvements
 
+* [#5464](https://github.com/spacemeshos/go-spacemesh/pull/5464) Make fetch request timeout configurable.
 * [#5467](https://github.com/spacemeshos/go-spacemesh/pull/5467)
   Fix a bug that could cause ATX sync to stall because of exhausted limit of concurrent requests for dependencies.
-  Fetching dependencies of an ATX is not limited anymore.  
+  Fetching dependencies of an ATX is not limited anymore.
 
 ## Release v1.3.3
 

fetch/fetch.go

@@ -100,9 +100,9 @@ func (s ServerConfig) toOpts() []server.Opt {
 type Config struct {
 	BatchTimeout         time.Duration
 	BatchSize, QueueSize int
-	RequestTimeout       time.Duration
 	MaxRetriesForRequest int
-	EnableServesMetrics  bool                    `mapstructure:"servers-metrics"`
+	RequestTimeout       time.Duration           `mapstructure:"request-timeout"`
+	EnableServerMetrics  bool                    `mapstructure:"servers-metrics"`
 	ServersConfig        map[string]ServerConfig `mapstructure:"servers"`
 	PeersRateThreshold   float64                 `mapstructure:"peers-rate-threshold"`
 	GetAtxsConcurrency   int64                   // The maximum number of concurrent requests to get ATXs.
@@ -289,7 +289,7 @@ func (f *Fetch) registerServer(
 		server.WithTimeout(f.cfg.RequestTimeout),
 		server.WithLog(f.logger),
 	}
-	if f.cfg.EnableServesMetrics {
+	if f.cfg.EnableServerMetrics {
 		opts = append(opts, server.WithMetrics())
 	}
 	opts = append(opts, f.cfg.getServerConfig(protocol).toOpts()...)