test: add basic v8 test tables

[xushiyan]

Description

Add test tables of v8.

For #379

How are the changes test-covered

• N/A
• Automated tests (unit and/or integration tests)
• Manual tests
  • Details are described below

[codope]

This is a good base test infra on which we can build further. Few suggestions for future work:

1. The current PR focuses on general v8 tables but lacks timeline-specific test scenarios. We need tables with tv = 8, tlv = v1 (where tv is table version and tlv is timeline layout version), a compacted LSM timeline (with compacted parquet files), multilayer timeline.
2. Migration and compatibility scenarios testing.

Let's merge this PR and we can add more tests once we land this PR and #395. One thing maybe we can do in the current PR is to add a README under crates/test/data to document all the test resources under the folder. This helps in understanding and also useful for maintainability. We did something similar in Presto and Trino:
https://github.com/prestodb/presto/blob/7d0f5bda49e9d5eed0a9c0bde38a513462be341d/presto-hive/src/test/resources/hudi-testing-data.md
https://github.com/trinodb/trino/blob/2a0ff847336060ec2a64e6cb43020eb9ea36db37/plugin/trino-hudi/src/test/resources/README.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.89%. Comparing base (35cbc6e) to head (d161ba8).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #394   +/-   ##
=======================================
  Coverage   88.89%   88.89%           
=======================================
  Files          49       49           
  Lines        2711     2711           
=======================================
  Hits         2410     2410           
  Misses        301      301           

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[xushiyan]

@codope sounds good. we need a lot more test cases. we can generate as needed when implementing relevant functions. In addition, we need some general cases like mentioned in #392

[codope]

@xushiyan Do you want to add README in this PR or a followup?