Integrate Hypernate as an external library

[bzp99]

Now that Hypernate exists as an independent library at ftsrg/hypernate, we should remove Hypernate-specific code from the TPC-C implementation and add Hypernate as an external dependency.

We can use jitpack, but the Hypernate repo has to become public first.

• Integrate Hypernate
• Use a Gradle repository instead of JAR

[bzp99]

b3a74c0 partially resolves this, but I will keep it open until we can get rid of the JAR