Add naming customisation options for introspector

[moghammed]

Description

I've added a way to customise the node and relationship names as they end up in the GraphQL Schema when using the introspector.

Complexity

Complexity: Low

Issue

Note

Please link to the GitHub issue(s) in which the proposal for this work was discussed

To link to multiple issues, use full syntax for each, for example Closes #1, closes #2, closes #3

Closes #4075

Checklist

The following requirements should have been met (depending on the changes in the branch):

• [x] Documentation has been updated
• [ ] TCK tests have been updated (Not available for introspector)
• [x] Integration tests have been updated
• [ ] Example applications have been updated (Not available for introspector)
• [ ] New files have copyright header (No new files)
• [ ] CLA (https://neo4j.com/developer/cla/) has been signed (awaiting approval)