refactor: remove VertexStorageProtocol [part 4/11]

[glevco]

Depends on #1163

Motivation

Previously, the VertexStorageProtocol was created during development of the Multiprocess Verification project, but as it's been on hold, that protocol is redundant and unnecessary.

For the P2P Multiprocess project, the traversal classes that currently use the VertexStorageProtocol will have to be callable from a subprocess, that is, it's storage calls will be though IPC. Since they only use the get_vertex method, I simplified them to only take exactly that. Then, I removed the VertexStorageProtocol as it was being used in only one other place (reward lock).

Acceptance Criteria

• Change Reward Lock functions to take a TransactionStorage instead of a VertexStorageProtocol.
• Change traversal classes to take a vertex_getter instead of a full VertexStorageProtocol.
• Remove VertexStorageProtocol.
• No changes in behavior.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                      Coverage Diff                       @@
##             feat/reactor-process-socket    #1164   +/-   ##
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  Hits                                   ?    21365           
  Misses                                 ?     3034           
  Partials                               ?      724           

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