GraphQL: Add timestamps

[ericenns]

What does this PR do and why?

Describe in detail what your merge request does and why.

This PR adds createdAt and updatedAt to all types in GraphQL API by adding a new BaseType which adds these fields. In addition attachmentsUpdateAt has been added to Sample type.

This also updates the GraphQL api to have a default page size of 25.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other pull requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Start server and navigate to GraphIQL interface (e.g. http://localhost:3000/graphiql)
2. In Docs view, verify that Attachment, Group, Namespace, Project, User types have createdAt and updatedAt fields
3. In Docs view, verify that Sample type has createdAt, updatedAt and attachmentsUpdatedAt fields
4. Execute queries and request the fields above and verify that no errors are raised.

PR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the PR acceptance checklist for this PR.

[github-actions]

Simplecov Report

Covered	Threshold
92.53%	90%

[malchua]

Looks good to me. Never got any errors when executing.

[ChrisHuynh333]

Looks good!