feat: add convert_to_delta

Add a convert_to_delta operation for converting a Parquet table to a Delta
Table in place.

crates/deltalake-core/src/kernel/schema.rs

@@ -1,6 +1,8 @@
 //! Delta table schema
 
+use std::borrow::Borrow;
 use std::fmt::Formatter;
+use std::hash::{Hash, Hasher};
 use std::sync::Arc;
 use std::{collections::HashMap, fmt::Display};
 
@@ -110,6 +112,34 @@ pub struct StructField {
     pub metadata: HashMap<String, MetadataValue>,
 }
 
+impl Hash for StructField {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.name.hash(state);
+    }
+}
+
+impl Borrow<str> for StructField {
+    fn borrow(&self) -> &str {
+        self.name.as_ref()
+    }
+}
+
+/*
+impl PartialEq for StructField {
+    fn eq(&self, other: &Self) -> bool {
+        self.path == other.path
+            && self.deletion_timestamp == other.deletion_timestamp
+            && self.data_change == other.data_change
+            && self.extended_file_metadata == other.extended_file_metadata
+            && self.partition_values == other.partition_values
+            && self.size == other.size
+            && self.tags == other.tags
+            && self.deletion_vector == other.deletion_vector
+    }
+} */
+
+impl Eq for StructField {}
+
 impl StructField {
     /// Creates a new field
     pub fn new(name: impl Into<String>, data_type: DataType, nullable: bool) -> Self {