Changelogs in Forge update checker

[Gaming32]

Is your suggested enhancement related to a problem? Please describe.

Forge and NeoForge support changelogs in their update.json files. Labrinth's generated forge_update.json files do not include this information.

Describe the solution you'd like

It would be useful to support this information.

Describe alternatives you've considered

No response

Additional context

The full format of update.json files is as follows:

{
  "homepage": "<homepage url>",
  "promos": {
    "<mc version 1>-recommended": "<version 1>",
    "<mc version 1>-latest": "<version 2>",
    "<mc version 2>-recommended": "<version 3>",
    "<mc version 2>-latest": "<version 4>"
  },
  "<mc version 1>": {
    "<version 1>": "<changelog for version 1>",
    "<version 2>": "<changelog for version 2>"
  },
  "<mc version 2>": {
    "<version 3>": "<changelog for version 3>",
    "<version 4>": "<changelog for version 4>"
  }
}

Currently Labrinth only provides the homepage and promos fields.