Graphql mutation node for analysis-framework membership

[susilnem]

Addresses Implement Graphql mutation node for analysis-framework membership

Changes

Mention related users here if any.

This PR doesn't introduce any:

• [ ] temporary files, auto-generated files or secret keys
• [ ] n+1 queries
• [ ] flake8 issues
• [ ] print
• [ ] typos
• [ ] unwanted comments

This PR contains valid:

• [ ] tests
• [ ] permission checks (tests here too)
• [ ] translations

[susilnem]

@thenav56 What to do with the Framework Membership permission?

[thenav56]

@susilnem I think we already have mutations for this. Can you check the analysis_framework_membership_bulk? https://github.com/the-deep/server/blob/develop/apps/analysis_framework/tests/test_mutations.py#L647