Cache state service account blob from disk reads

[kspearrin]

Type of change

• Bug fix
• New feature development
• Tech debt (refactoring, code cleanup, dependency upgrades, etc)
• Build/deploy pipeline (DevOps)
• Other

Objective

Prevent so much disk i/o with the new large account object being read so much.

Code changes

Adds an account cache in memory to buffer the disk reads.

Testing requirements

Regression

Before you submit

• I have checked for linting errors (npm run lint) (required)
• I have added unit tests where it makes sense to do so (encouraged but not required)
• This change requires a documentation update (notify the documentation team)
• This change has particular deployment requirements (notify the DevOps team)