feat: Avail gas relay upgrade (#3601)

## What ❔

This PR upgrades Avail Turbo DA from v0.1 to v1 with significant API
changes and improvements to the authentication system. The upgrade
includes a complete overhaul of the API endpoints structure,
authentication mechanism (moving from JWT to API keys), and internal
architecture improvements.

## Why ❔

Improve security through better API key management and support for
multiple keys per user
Enhance performance with better latency and higher throughput
capabilities
Create a more maintainable and extensible codebase through modular
design
Establish proper API versioning to better manage future updates and
backwards compatibility
Standardize endpoint structures by removing redundant path segments

## Is this a breaking change?
- [ ] Yes
- [x] No

## Operational changes
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## Checklist

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- [ ] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [ ] Code has been formatted via `zkstack dev fmt` and `zkstack dev
lint`.

core/node/da_clients/src/avail/sdk.rs

@@ -443,14 +443,14 @@ impl GasRelayClient {
     }
 
     pub(crate) async fn post_data(&self, data: Vec<u8>) -> anyhow::Result<(H256, u64)> {
-        let submit_url = format!("{}/user/submit_raw_data?token=ethereum", &self.api_url);
+        let submit_url = format!("{}/v1/submit_raw_data", &self.api_url);
         // send the data to the gas relay
         let submit_response = self
             .api_client
             .post(&submit_url)
             .body(Bytes::from(data))
-            .header("Content-Type", "text/plain")
-            .header("Authorization", format!("Bearer {}", self.api_key))
+            .header("Content-Type", "application/octet-stream")
+            .header("x-api-key", &self.api_key)
             .send()
             .await
             .context("Failed to submit data to the gas relay")?;
@@ -472,15 +472,15 @@ impl GasRelayClient {
             };
 
         let status_url = format!(
-            "{}/user/get_submission_info?submission_id={}",
+            "{}/v1/get_submission_info?submission_id={}",
             self.api_url, submit_response.submission_id
         );
 
         tokio::time::sleep(Self::DEFAULT_INCLUSION_DELAY).await;
         let status_response = (|| async {
             self.api_client
                 .get(&status_url)
-                .header("Authorization", format!("Bearer {}", self.api_key))
+                .header("x-api-key", &self.api_key)
                 .send()
                 .await
         })