feat(fs): introduce Jindo file system support

[zjw1111]

Purpose

Linked issue: N/A

Introduce Jindo file system support and restore the Jindo build integration removed by #144.

This PR:

• adds the complete src/paimon/fs/jindo implementation and tests;
• adds the bundled third_party/jindosdk-nextarch adapter;
• restores the PAIMON_ENABLE_JINDO option, SDK acquisition, build targets, test linkage, and CI build flag; and
• restores the Jindo build and plugin documentation.

All 22 requested migration files are included. No requested files were skipped and no additional dependency files were added.

Alibaba headers in src/paimon/fs/jindo were converted to ASF license headers. The bundled jindosdk-nextarch Apache-2.0 license, notice, and original copyright statements were preserved. No root LICENSE or NOTICE update was needed because the component carries its own LICENSE.txt and NOTICE.txt.

External contributor analysis did not reach the batch-level or per-file thresholds, so no Co-authored-by trailer or contributor thank-you comment is required.

Tests

API and Format

Adds the optional Jindo file system plugin. There are no storage format or protocol changes.

Documentation

Restores the Jindo optional-component and plugin documentation removed by #144.

Generative AI tooling

Migrated-by: OpenAI Codex

[lxy-9602]

+1

[JingsongLi]

+1