feat(global-index): support checkpoints for Lumina index builds

[lszskye]

Purpose

Add checkpoint support for Lumina global index builds.

This change:

• introduces GlobalIndexCheckpointFileManager as a plugin-facing checkpoint storage interface;

• lets GlobalIndexFileManager optionally manage checkpoint scanning and I/O;

• adds task-scoped checkpoint paths in the following form:
  [index_type]-global-index-[field_name]-[range_from]-[range_to]-[task_id]-[id].index.ckpt

• discovers the latest checkpoint using its numeric ID and continues allocating IDs from it;

• adds GlobalIndexer::SupportsCheckpoint() so checkpoint storage is created only for index implementations that support it;

• adds an optional task_id to GlobalIndexWriteTask::WriteIndex;

• adapts Paimon checkpoint storage to Lumina's checkpoint manager;

• restores Lumina builds from the latest matching checkpoint;

• deletes matching checkpoints after a successful build;

• when a build using an existing checkpoint fails, deletes the checkpoint and retries once from scratch;

• isolates checkpoints by index type, field, row range, and task ID.

Index implementations that do not support checkpoints keep their existing behavior.

Tests

src/paimon/core/global_index/global_index_file_manager_test.cpp
src/paimon/core/utils/file_store_path_factory_test.cpp
src/paimon/global_index/lumina/lumina_global_index_test.cpp
test/inte/global_index_test.cpp

API and Format

• adds GlobalIndexer::SupportsCheckpoint(), which returns false by default;
• adds GlobalIndexCheckpointFileManager;
• adds an optional task_id argument to GlobalIndexWriteTask::WriteIndex.

[lxy-9602]

+1