XTable performs incorrect schema sync during Delta to Iceberg conversion when a column is renamed in the Delta table. #711

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Please describe the bug 🐞

I'm performing a Delta to Iceberg conversion using XTable. I renamed a column in the Delta table from "name" to "FullName". In the generated Iceberg schema, XTable removed the original "name" field (field ID: 2) and added a new field "FullName" with a new field ID: 5. Below is the Iceberg schema XTable generated:
"schemas" : [ {
"type" : "struct",
"schema-id" : 0,
"fields" : [ {
"id" : 1,
"name" : "id",
"required" : false,
"type" : "int"
}, {
"id" : 2,
"name" : "name",
"required" : false,
"type" : "string"
}, {
"id" : 3,
"name" : "role",
"required" : false,
"type" : "string"
}, {
"id" : 4,
"name" : "address",
"required" : false,
"type" : "string"
} ]
}, {
"type" : "struct",
"schema-id" : 1,
"fields" : [ {
"id" : 1,
"name" : "id",
"required" : false,
"type" : "int"
}, {
"id" : 3,
"name" : "role",
"required" : false,
"type" : "string"
}, {
"id" : 4,
"name" : "address",
"required" : false,
"type" : "string"
}, {
"id" : 5,
"name" : "FullName",
"required" : false,
"type" : "string"
} ]
} ]

XTable should have retained the original field ID (2) and simply updated the column name to "FullName" to reflect a rename, not a new field addition.

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