Don't expect DAS config in HTTP spec response (#6221)

Squashed commit of the following:

commit a4b1343
Author: Michael Sproul <[email protected]>
Date:   Mon Aug 5 11:12:54 2024 +1000

    Don't expect DAS config in HTTP spec response

Author: michaelsproul

consensus/types/src/chain_spec.rs

@@ -1365,10 +1365,13 @@ pub struct Config {
     #[serde(with = "serde_utils::quoted_u64")]
     max_per_epoch_activation_exit_churn_limit: u64,
 
+    #[serde(default = "default_custody_requirement")]
     #[serde(with = "serde_utils::quoted_u64")]
     custody_requirement: u64,
+    #[serde(default = "default_data_column_sidecar_subnet_count")]
     #[serde(with = "serde_utils::quoted_u64")]
     data_column_sidecar_subnet_count: u64,
+    #[serde(default = "default_number_of_columns")]
     #[serde(with = "serde_utils::quoted_u64")]
     number_of_columns: u64,
 }
@@ -1509,6 +1512,18 @@ const fn default_maximum_gossip_clock_disparity_millis() -> u64 {
     500
 }
 
+const fn default_custody_requirement() -> u64 {
+    1
+}
+
+const fn default_data_column_sidecar_subnet_count() -> u64 {
+    32
+}
+
+const fn default_number_of_columns() -> u64 {
+    128
+}
+
 fn max_blocks_by_root_request_common(max_request_blocks: u64) -> usize {
     let max_request_blocks = max_request_blocks as usize;
     RuntimeVariableList::<Hash256>::from_vec(