Expose Delta Uniform write commit size in logs (delta-io#3898)

<!--
Thanks for sending a pull request!  Here are some tips for you:
1. If this is your first time, please read our contributor guidelines:
https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md
2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP]
Your PR title ...'.
  3. Be sure to keep the PR description updated to reflect all changes.
  4. Please write your PR title to summarize what this PR proposes.
5. If possible, provide a concise example to reproduce the issue for a
faster review.
6. If applicable, include the corresponding issue number in the PR title
and link it in the body.
-->

#### Which Delta project/connector is this regarding?
<!--
Please add the component selected below to the beginning of the pull
request title
For example: [Spark] Title of my pull request
-->

- [x] Spark
- [ ] Standalone
- [ ] Flink
- [ ] Kernel
- [ ] Other (fill in here)

## Description
Expose Delta Uniform write commit size in logs

iceberg/src/main/scala/org/apache/spark/sql/delta/icebergShaded/IcebergConversionTransaction.scala

@@ -72,6 +72,7 @@ class IcebergConversionTransaction(
 
   protected abstract class TransactionHelper(impl: PendingUpdate[_]) {
     private var committed = false
+    var writeSize = 0L
 
     def opType: String
 
@@ -94,6 +95,7 @@ class IcebergConversionTransaction(
     override def opType: String = "append"
 
     def add(add: AddFile): Unit = {
+      writeSize += add.size
       appender.appendFile(
         convertDeltaAddFileToIcebergDataFile(
           add,
@@ -134,6 +136,7 @@ class IcebergConversionTransaction(
     override def opType: String = "overwrite"
 
     def add(add: AddFile): Unit = {
+      writeSize += add.size
       overwriter.addFile(
         convertDeltaAddFileToIcebergDataFile(
           add,
@@ -169,6 +172,7 @@ class IcebergConversionTransaction(
     override def opType: String = "rewrite"
 
     def rewrite(removes: Seq[RemoveFile], adds: Seq[AddFile]): Unit = {
+      writeSize += adds.map(_.size).sum
       val dataFilesToDelete = removes.map { f =>
         assert(!f.dataChange, "Rewrite operation should not add data")
         convertDeltaRemoveFileToIcebergDataFile(
@@ -487,7 +491,9 @@ class IcebergConversionTransaction(
         "version" -> postCommitSnapshot.version,
         "timestamp" -> postCommitSnapshot.timestamp,
         "tableOp" -> tableOp.getClass.getSimpleName.stripSuffix("$"),
-        "prevConvertedDeltaVersion" -> lastConvertedDeltaVersion
+        "prevConvertedDeltaVersion" -> lastConvertedDeltaVersion,
+        "tableSize" -> postCommitSnapshot.sizeInBytes,
+        "commitWriteSize" -> fileUpdates.map(_.writeSize).sum
       ) ++ icebergTxnTypes ++ errorData
     )
   }