registry: add reworked /extensions/all endpoint (in beta)

[vrmiguel]

@ChuckHend figured out a way to speed up /extensions/all with a single query

This PR proposes adding this new code under a new temporary endpoint for testing.
If the testing goes well, removing the older code would be very straightforward

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[ChuckHend]

We still have a diff between this new query and what the existing /extensions/all returns. the "owners" key is missing the userId

Current:

  {
    "categories": [
      "Tooling / Admin"
    ],
    "createdAt": "2023-04-21 20:00:22.576493 +00:00:00",
    "description": "adminpack provides a number of support functions which pgAdmin and other administration and management tools can use to provide additional functionality, such as remote management of server log files.",
    "documentation": "https://www.postgresql.org/docs/current/adminpack.html",
    "homepage": "https://www.postgresql.org",
    "latestVersion": "2.1.0",
    "license": "PostgreSQL",
    "name": "adminpack",
    "owners": [
      {
        "userId": "user_2PXTvcubP95TyEvTXZJOpzHjdJn",
        "userName": "coredb-service-user"
      }
    ],
    "repository": "https://github.com/postgres/postgres/tree/master/contrib/adminpack",
    "updatedAt": "2023-08-28 18:48:27.880262 +00:00:00"
  },

In this PR:

{
  "categories": [
    "Tooling / Admin"
  ],
  "created_at": "2023-04-21T20:00:22.576493Z",
  "description": "adminpack provides a number of support functions which pgAdmin and other administration and management tools can use to provide additional functionality, such as remote management of server log files.",
  "documentation": "https://www.postgresql.org/docs/current/adminpack.html",
  "homepage": "https://www.postgresql.org",
  "latest_version": "2.1.0",
  "license": "PostgreSQL",
  "name": "adminpack",
  "owners": [
    "coredb-service-user"
  ],
  "repository": "https://github.com/postgres/postgres/tree/master/contrib/adminpack",
  "updated_at": "2023-08-28T18:48:27.880262Z"
}

[ChuckHend]

Updated again - new object:

  {
    "categories": [
      "Tooling / Admin"
    ],
    "created_at": "2023-04-21T20:00:22.576493Z",
    "description": "adminpack provides a number of support functions which pgAdmin and other administration and management tools can use to provide additional functionality, such as remote management of server log files.",
    "documentation": "https://www.postgresql.org/docs/current/adminpack.html",
    "homepage": "https://www.postgresql.org",
    "latest_version": "2.1.0",
    "license": "PostgreSQL",
    "name": "adminpack",
    "owners": [
      {
        "userId": "user_2PXTvcubP95TyEvTXZJOpzHjdJn",
        "userName": "coredb-service-user"
      }
    ],
    "repository": "https://github.com/postgres/postgres/tree/master/contrib/adminpack",
    "updated_at": "2023-08-28T18:48:27.880262Z"
  }

[ChuckHend]

latest format:

{
    "categories": [
      "Tooling / Admin"
    ],
    "createdAt": "2023-04-21T20:00:22.576493+00:00",
    "description": "adminpack provides a number of support functions which pgAdmin and other administration and management tools can use to provide additional functionality, such as remote management of server log files.",
    "documentation": "https://www.postgresql.org/docs/current/adminpack.html",
    "homepage": "https://www.postgresql.org",
    "latestVersion": "2.1.0",
    "license": "PostgreSQL",
    "name": "adminpack",
    "owners": [
      {
        "userId": "user_2PXTvcubP95TyEvTXZJOpzHjdJn",
        "userName": "coredb-service-user"
      }
    ],
    "repository": "https://github.com/postgres/postgres/tree/master/contrib/adminpack",
    "updatedAt": "2023-08-28T18:48:27.880262+00:00"
  }

[ianstanton]

Nice idea adding as separate route :)