[Spark] Add utils to find logPath from dataPath in CoordinatedCommits…

…Utils (#3779)

#### Which Delta project/connector is this regarding?

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

## Description

Add utils to find logPath from dataPath in CoordinatedCommitsUtils

## How was this patch tested?

Build

## Does this PR introduce _any_ user-facing changes?

No

storage/src/main/java/io/delta/storage/commit/CoordinatedCommitsUtils.java

@@ -35,6 +35,9 @@ public class CoordinatedCommitsUtils {
 
     private CoordinatedCommitsUtils() {}
 
+    /** The subdirectory in which to store the delta log. */
+    private static final String LOG_DIR_NAME = "_delta_log";
+
     /** The subdirectory in which to store the unbackfilled commit files. */
     private static final String COMMIT_SUBDIR = "_commits";
 
@@ -127,6 +130,11 @@ public static FileStatus writeUnbackfilledCommitFile(
         return commitPath.getFileSystem(hadoopConf).getFileStatus(commitPath);
     }
 
+    /** Returns path to the directory which holds the delta log */
+    public static Path logDirPath(Path tablePath) {
+        return new Path(tablePath, LOG_DIR_NAME);
+    }
+
     /** Returns path to the directory which holds the unbackfilled commits */
     public static Path commitDirPath(Path logPath) {
         return new Path(logPath, COMMIT_SUBDIR);