fix: couple blobber interface issues

Author: prestwich

crates/blobber/src/config.rs

@@ -19,6 +19,11 @@ pub struct BlockExtractorConfig {
 }
 
 impl BlockExtractorConfig {
+    /// Create a new `BlockExtractorConfig` with default values.
+    pub fn new(blob_explorer_url: Cow<'static, str>) -> Self {
+        Self { blob_explorer_url, cl_url: None, pylon_url: None }
+    }
+
     /// Create a new `BlockExtractorConfig` with the provided CL URL, Pylon URL,
     pub fn cl_url(&self) -> Option<&str> {
         self.cl_url.as_deref()

crates/blobber/src/lib.rs

@@ -15,7 +15,7 @@ mod block_data;
 pub use block_data::{Blobs, BlockExtractor};
 
 mod builder;
-pub use builder::BlockExtractorBuilder;
+pub use builder::{BlockExtractorBuilder, BuilderError as BlockExtractorBuilderError};
 
 mod config;
 pub use config::BlockExtractorConfig;