feat(puffin): Parse Puffin FileMetadata (#765)

* Add Puffin FileMetadata

* Fix comment locations

* Put Ok(()) branch first

* Use map_err

* Inline err_out_of_bounds function

* Use ok_or_else

* Remove #[rustfmt::skip]

* Rename input_fields to fields

* Simplify flag parsing

* Remove unnecessary reference

* Make BlobMetadata.length a u64 (instead of usize)

* Replace from with as

crates/iceberg/src/puffin/compression.rs

@@ -15,10 +15,13 @@
 // specific language governing permissions and limitations
 // under the License.
 
+use serde::{Deserialize, Serialize};
+
 use crate::{Error, ErrorKind, Result};
 
-#[derive(Debug, PartialEq, Eq, Clone, Copy, Default)]
 /// Data compression formats
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Default, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
 pub enum CompressionCodec {
     #[default]
     /// No compression