feat: Duplicate functions in ProtoParserTools.java

Adds PbjReader overloads alongside nearly every existing read method in `ProtoParserTools`, delegating to PbjReader's typed methods. Purely additive — no call sites switched yet.

**Benefit:** de-risks the cutover by making the new read path available without changing existing behavior.

PR: hashgraph/pbj#911

Start in ProtoParserTools.java and compare its existing read methods with the typed methods available on PbjReader. Add the corresponding PbjReader overloads without changing existing call sites or behavior; done means the new read path is available alongside the existing methods.

Written by the indexing model from the issue text.