feat: adds close state checking for snapshot reader and writer

Walkthrough

The updates enhance the thread-safety and state management of snapshot-related classes in the JRaft library. Critical modifications include marking multiple classes as not thread-safe and introducing state checks for proper resource handling in snapshot reader and writer classes.

Changes

Files	Change Summary
`.../jraft/storage/snapshot/SnapshotReader.java` `.../jraft/storage/snapshot/SnapshotWriter.java` `.../jraft/storage/snapshot/local/SnapshotFileReader.java`	Added notes in documentation to indicate that the classes are not thread-safe, improving clarity about the limitations of these classes.
`.../jraft/storage/snapshot/local/LocalSnapshotReader.java`	Added a `closed` field, a `checkState()` method, and updated the `close()` method to check state before closing, enhancing state management to avoid operating on closed readers.
`.../jraft/storage/snapshot/local/LocalSnapshotWriter.java`	Introduced a `closed` field, a `checkState()` method, and state checks in multiple methods (`close()`, `saveMeta()`, `sync()`, `addFile()`, `removeFile()`) to ensure proper state handling.

Assessment against linked issues

Objective (Issues)	Addressed	Explanation
Improve thread-safety of snapshot classes (#1099)	✅

In code we trust, we make it right, Ensuring threads won't clash with might. A reader closed, a state that's known, Our snapshots safe, stability shown.

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sofastack / sofa-jraft