Replace `org.apache.commons.lang3.tuple.Pair` with own implementation

We currently rely on multiple third-party libraries, which has led to increased technical debt. Specifically, we have an internal utility class `com.swirlds.base.utility.Pair` that should be used consistently throughout the entire repository.

Identify and replace instances of third-party utility classes with `com.swirlds.base.utility.Pair` across the entire codebase.

Start by reading com.swirlds.base.utility.Pair and searching the repository for uses of org.apache.commons.lang3.tuple.Pair. Replace the third-party utility instances with the internal Pair implementation across the codebase, then verify that no such uses remain.

Written by the indexing model from the issue text.