feat(admin-api): add get revision by location ID endpoint

[shiyasmohd]

• Add GET /revisions/{id} to retrieve a single physical table revision by its location ID, including path, active status, writer, and metadata.
• Add integration tests for success, not-found, deactivation, and invalid ID cases

Example Output

{
  "id": 1,
  "path": "mainnet/blocks/019c55a7-df24-7ca1-b990-1054b7a3f437",
  "active": true,
  "writer": 1,
  "metadata": {
    "dataset_namespace": "edgeandnode",
    "dataset_name": "mainnet",
    "manifest_hash": "3653ba10dced7e02241c92d921e7ec94b587d9c1718839588cbb88fee8e9f2b1",
    "table_name": "blocks"
  }
}

[LNSD]

We need to update the docs/features/admin-revisions.md document to document this new functionality. And also, update ampctl (and the Admin Client) to support these changes.

I leave the decision of where to implement those to you. Either in this PR or in a follow-up PR.

[shiyasmohd]

All comments addressed in 28364bc