[Feature] Parser

[Slickbird]

🚀 Feature of #106

Rust based Rosetta Impl of Parser

Description:

• The Parser package provides support for parsing Rosetta blocks. This includes things like calculating all the balance changes that occurred in a block and grouping related operations.

Motivation:

• Parser provides a collection of helpers to make block parsing easier. The parser can calculate all balance changes in a block, group related operations, and match an operation description with an operation in a transaction.