Update metamist project member provider to handle new permissions structure

[dancoates]

Relates to populationgenomics/metamist#829

• Update custom metamist project member provider to send through a list of members and roles for a project, rather than adding members to specific groups.
• Add contributor role for anyone tagged as an analysis member

[codecov-commenter]

Codecov Report

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #239 +/- ## ======================================= Coverage ? 90.61% ======================================= Files ? 4 Lines ? 426 Branches ? 0 ======================================= Hits ? 386 Misses ? 40 Partials ? 0 ```

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