Implement Index Left Matching in BaseSqlMapGenerator

[coderabbitai[bot]]

There's a TODO comment in the method of the class, indicating the need for implementing index left matching. This enhancement is related to the Data Access Layer (DAL) features introduced in PR https://github.com/eggjs/tegg/pull/192.

The specific TODO can be found in the diff for .

This issue was requested to be opened by @fengmk2 in the PR discussion: https://github.com/eggjs/tegg/pull/192#discussion_r1532283921