Codebase Switchover: Hashgraph -> Hiero

[rbarker-dev]

Problem

The hiero-sdk-js codebase is being dual published under both the crates/hashgraph and crates/hiero namespaces. The publish starts with the publish to hashgraph then modifies the source files to make them hiero-centric. We need to swap this order.

Solution

Swap the codebase to be hiero-based and then during the dual publish workflow publish to hiero first, then switch the source to be hashgraph-centric and publish to that namespace.

Alternatives

This needs to happen before the dual publish window ends so that when dual publishing is complete we simply turn off the hashgraph namespace publish.