Modify ADBPG configuration file format

[swhhy]

Summary

• Add structured ADBPG build, search, and autotune parameters.
• Keep compatibility with existing flattened ADBPG configuration.
• Add regression tests, README documentation, and a Cohere-1M example.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: swhhy
To complete the pull request process, please assign xuanyang-cn after the PR has been reviewed.
You can assign the PR to them by writing /assign @xuanyang-cn in a comment when ready.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[swhhy]

/assign @XuanYang-cn

Thank you for the review. This PR updates only the ADBPG client by introducing structured build, search, and autotune parameters. A Cohere-1M example and regression tests have been added, and the targeted test suite and Ruff checks pass.