feat: add checksums verification to Gradle

[validcube]

🔧 Add checksums check to Gradle

Allows for verification for the downloaded binary using SHA-256 hash comparison. This increases security against targeted attacks by preventing a man-in-the-middle attacker from tampering with the downloaded Gradle and in rare case, attacker gets access to the Gradle servers.

• add distributionSha256Sum to Gradle properties

Note

• The checksum is provided here - https://gradle.org/release-checksums/

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Resource

• Gradle documentation - Configuring SHA-256 checksum verification

[validcube]

I love git

[SodaWithoutSparkles]

while we are here, should we add sha256 checksums to revanced manager's release?