Add user read access to kgraph

[mike-audi]

User API access to the kgraph was remove a couple sprints ago in favor of a server to server communication with API keys for security.

However, the user's app needs to be able to access the service to fetch company information like the logo.

We need to add back in the code for oauth access via JWTs and the code which allows varying access scopes based on the security credentials.

Acceptance Criteria:

• Users can fetch company data
• Users cannot write edges
• Ingestion service can write edges

[mike-audi]

• Test: Users can fetch company data - pass • Test: Users cannot write edges - pass • Test: Ingestion service can write edges - pass