Dependencies: Upgrade Scala to 3.3.3

[alexklibisz]

Related Issue

Resolves #393

Changes

• Migrated to Scala 3.3.3 (latest LTS)
• Replaced dependency on circe-generic-extras with circe-generic because (1) it hasn't been published for Scala 3, (2) I fiddled with the ability to use 2.13 libraries in Scala 3, but that caused some build warnings that were causing intellij to fail to load the project; (3) we're actually only using functionality from circe-generic.
• Removed dependency on com.klibisz.futil because it's only published for 2.13 and was easier to just replace with a couple utility methods than to cross publish that library for scala 3.
• Some minor syntactic changes, e.g., adding type annotations, wrapping anonymous function params in parens.
• One test in PermutationLshModelSuite required rounding some floats that I was comparing, because they were consistently no longer equal at the seventh decimal. I'm not sure how that could be related to Scala 3. I got tired of looking at it and just truncated at the sixth decimal.
• Had to slightly restructure the VectorMapper class because it was hitting a part of the scala runtime that invoked sun.misc.Unsafe. This was by far the most confusing part of the migration. I spent several hours trying to figure out why we needed to add elevated permissions to access sun.misc.unsafe. It seems to be related to this issue: Runtime code implementing lazy val should not use sun.misc.Unsafe on Java 9+ (JEP-471) scala/scala3#9013. It was particularly confusing because the error is coming from scala.runtime.LazyVals, but I'm not using any LazyVals. Through trial and error, I figured out that converting an object inside an abstract class to a final class inside the same abstract class would circumvent the issue. The alternative would have been to add back several runtime permissions to plugin-security.policy, which I wanted to avoid.

Testing and Validation

Standard CI.