Add support for zstd compressed depot chunks

[LossyDragon]

Description

Add support for zstd compressed depot chunks

zstd is a compileOnly depdency. Users will need to implement it on their own.

For example:

// JVM
implementation("com.github.luben:zstd-jni:1.5.7-3")

// Android 
implementation("com.github.luben:zstd-jni:1.5.7-3") { artifact { type = "aar" } }

Otherwise content downloading does catch the missing classes and cancels downloading with error logs about missing dependency.

Closes #334

Checklist

• Code compiles correctly
• All tests passing
• Samples run successfully
• Extended the README / documentation, if necessary