IGNITE-27924 Expose size of log storage manager data on disk

[rpuch]

https://issues.apache.org/jira/browse/IGNITE-27924

[Copilot]

Pull request overview

This pull request adds functionality to expose the size of log storage manager data on disk, addressing JIRA issue IGNITE-27924. The implementation adds a new totalBytesOnDisk() method to the LogStorageManager interface and provides implementations across all concrete log storage manager classes.

Changes:

• Added totalBytesOnDisk() method to LogStorageManager interface
• Implemented disk size tracking using RocksDB's SstFileManager and WAL file enumeration for RocksDB-based managers
• Implemented file system walking for Logit-based storage manager
• Added comprehensive test coverage for RocksDB-based implementations

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/LogStorageManager.java	Added new interface method totalBytesOnDisk()
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/impl/RocksDbSizeCalculator.java	New utility class to calculate RocksDB storage size (SST files + WAL files)
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/impl/DefaultLogStorageManager.java	Implemented disk size tracking with RocksDB's SstFileManager, added env and sstFileManager fields
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/impl/VolatileLogStorageManagerCreator.java	Added disk size tracking infrastructure and exposed totalBytesOnDisk() at creator level
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/impl/VolatileLogStorageManager.java	Returns 0 as this is volatile storage with the actual tracking at creator level
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/impl/LocalLogStorageManager.java	Returns 0 as this uses on-heap storage with no disk footprint
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/logit/LogitLogStorageManager.java	Implemented using Files.walk() to traverse directory tree and sum file sizes
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/impl/DefaultLogStorageManagerTest.java	Added tests for WAL and SST file size tracking, introduced @DisableFsync annotation
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/impl/VolatileLogStorageManagerCreatorTest.java	New test file covering disk size reporting for volatile storage with spillout
modules/raft/src/integrationTest/java/org/apache/ignite/internal/raft/ItTruncateSuffixAndRestartTest.java	Updated test implementation to include totalBytesOnDisk() stub

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