Add build hashes

[fire-light42]

While I was tinkering with the gradle updates I also added a feature I have been wanting for a good while: build hashes.

This would make it possible for CloudStream to verify that the downloaded plugin is actually correct and not a rate limiting page from Github (common issue when mass-downloading plugins).

It just adds a hash to the plugins json. For example:

    {
        "iconUrl": "https://www.google.com/s2/favicons?domain=archive.org&sz=%size%",
        "jarFileSize": 125513,
        "fileHash": "sha256-2ca6e3a54d688e7b2d8fa2a95b9059157c99d6e624bcbc780b2bbac3320452c5",
        "apiVersion": 1,
        "repositoryUrl": "https://github.com/user/repo",
        "fileSize": 28034,
        "status": 1,
        "authors": [
            "Luna712"
        ],
        "tvTypes": [
            "Others"
        ],
        "version": 1,
        "internalName": "InternetArchiveProvider",
        "jarUrl": "https://raw.githubusercontent.com/user/repo/builds/InternetArchiveProvider.jar",
        "description": "Watch content from the Internet Archive at archive.org",
        "url": "https://raw.githubusercontent.com/user/repo/builds/InternetArchiveProvider.cs3",
        "name": "InternetArchiveProvider",
        "jarHash": "sha256-92a312dc4694f5c4c1570eb8bb2260a4b82c25a34a80b398195af7052018ed6c"
    }
    

[fire-light42]

@Luna712 What do you think?

[Luna712]

Very nice! But if this will cause more conflicts with #10, could it be done after? I dont know if it will though. But it is a very nice feature.

UPDATE: I meant tested on top of it, not necessarily a merge conflict which I could resolve if so.

[fire-light42]

I do not think it will cause conflicts, the changes are small. Either way the earliest pull request takes precedence if there is a risk of conflicts.

[Luna712]

Yeah, realized my earlier message was unclear. I could resolve merge conflicts I just meant tested on top of it.

[Luna712]

Either way, this is an amazing addition and solves one issue I've ran into before myself as well.

[Luna712]

Hmm actually... what about extensions that havent been rebuilt after this addition yet and thus wouldn't have a hash?

[fire-light42]

My plan is to have something like:

if (hash != null) checkHash()

While waiting for adoption.