[Enhancement]: Introduce dbid file to uniquely identify an eloqstore instance

[githubzilla]

Current Behavior

There is no check if local db files and the remote db files are belong to same database when database open.

Proposed Improvement

We need a dbid file to uniquely identify an eloqstore instance. Without it, when opening an eloqstore from an object store, the system may incorrectly assume that local database files belong to the same database as the remote ones, leading to potential data integrity issues.