feat(admin-api): add list table revisions endpoint

[shiyasmohd]

• Add GET /revisions to list all physical table revisions. Supports ?active=(true/false) filter

Example Output

[
  {
    "id": 3,
    "path": "mainnet/logs/019c5ac2-bec6-7ea1-86b1-99ede8b154ec",
    "active": true,
    "writer": 1,
    "metadata": {
      "dataset_namespace": "s",
      "dataset_name": "mainnet",
      "manifest_hash": "3653ba10dced7e02241c92d921e7ec94b587d9c1718839588cbb88fee8e9f2b1",
      "table_name": "logs"
    }
  }
]

[LNSD]

The current endpoint GET /revisions/{namespace}/{name}/{revision}/{table_name} introduces unnecessary complexity.

I would suggest replacing it with a simple GET /revisions that lists all physical table revisions directly, with no dataset join needed.

This aligns naturally with the existing revision endpoints:

GET  /revisions                  <- list all (new)
POST /revisions/{id}/activate    <- existing
POST /revisions/{id}/deactivate  <- existing

If filtering is needed, query parameters are the natural fit:

GET /revisions
GET /revisions?active=true  <- Return only the active revisions