[TRIVIAL] Change the defaults in price estimation (#3007)

# Description
Change the defaults in the price estimation. The reason is that if by
accident we don't configure it (as it happened...), we don't burn out
API credits fast.

The default values should be reasonable.

crates/shared/src/price_estimation.rs

@@ -138,7 +138,7 @@ pub struct Arguments {
     #[clap(
         long,
         env,
-        default_value = "30s",
+        default_value = "10m",
         value_parser = humantime::parse_duration,
     )]
     pub native_price_cache_max_age: Duration,
@@ -150,7 +150,7 @@ pub struct Arguments {
     #[clap(
         long,
         env,
-        default_value = "2s",
+        default_value = "80s",
         value_parser = humantime::parse_duration,
     )]
     pub native_price_prefetch_time: Duration,