Included REST Spec Changes

[nathannaveen]

Description of the PR

• Second Part of Search REST via Purl #2089
• All the OpenAPI Spec changes have been included
• The /query/dependencies is no longer going to be used, instead, the /v0/package/{purl}/dependencies and /v0/artifact/{digest}/dependencies will be replacing it.
• The code in retrieveDependencies.go has been updated to work for the new endpoints.
• The error handling code has also been updated.

PR Checklist

• All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• All new changes are covered by tests
• If GraphQL schema is changed, make generate has been run
• If GraphQL schema is changed, GraphQL client updates/additions have been made
• If OpenAPI spec is changed, make generate has been run
• If ent schema is changed, make generate has been run
• If collectsub protobuf has been changed, make proto has been run
• All CI checks are passing (tests and formatting)
• All dependent PRs have already been merged

[nathannaveen]

👀 @pxp928 @mdeicas @lumjjb

[mdeicas]

This is a great change, thanks @nathannaveen! Thank you as well for splitting the original PR up and adding documentation to the API spec. I added comments but overall it looks good.