Allow setting a custom baseCachePath for updater download location

[ImVeryLost]

• Electron-Builder Version: 25.1.8
• Electron-updater Version: 6.3.9

• Node Version: 20.x

• Electron Version: 33.0.2
• Electron Type (current, beta, nightly): current

• Target: windows, linux, mac

Currently, the following locations are used:

%localAppData%/{updaterCacheDirName}  - windows
{homeDir}/Library/Caches/{updaterCacheDirName} - mac
{homeDir}/.cache/{updaterCacheDirName} - linux

I would like to change the download location to include orgName folder:

%localAppData%/{orgName}/{updaterCacheDirName}  - windows
{homeDir}/Library/Caches/{orgName}/{updaterCacheDirName} - mac
{homeDir}/.cache/{orgName}/{updaterCacheDirName} - linux

however, there is no way to currently do that.

Things i considered:

1. updaterCacheDirName - it's formed from the sanitized app name + -updater. So there is no way to change it to {orgName}/{appName}, since any slashes will be removed when sanitizing the app name..

2. baseCacheDir is in AppAdapter class. I can pass a custom AppAdapter when initializing AppUpdater, but then httpExecutor is set to null:

    if (app == null) {
      this.app = new ElectronAppAdapter()
      this.httpExecutor = new ElectronHttpExecutor((authInfo, callback) => this.emit("login", authInfo, callback))
    } else {
      this.app = app
      this.httpExecutor = null as any
    }

I assume thats because the custom AppAdapter is mostly used for tests? AppAdapter doesnt seem to be documented, so I cannot tell if it's something I should be using or not.

I would be willing to make a PR to allow customizing the cache dir, either by: updating the AppUpdater constructor to not set httpExecutor to null, or by adding the baseCacheDir to AllPublishOptions. Let me know if that's something you would consider & which option you would prefer.

Note: I saw this issue for the same feature request, but it's been closed for a while now. I can close this one if you guys want to reopen that one instead.