Roles refactoring: Add new project_member table, update getter/setter…

[MarcelGeo]

Resolves https://github.com/MerginMaps/server-private/issues/2586

[MarcelGeo]

migration is not running without intarray extension in postgres.
possible alternative would be use EXCEPT operator

SELECT DISTINCT project_id, user_id, role FROM (SELECT
                        project_id AS project_id,
                        unnest(owners) AS user_id,
                        'owner' AS role
                FROM project_access
UNION
SELECT
    project_id,
    unnest(writer_ids) AS user_id,
    'writer' AS role
FROM (
    SELECT
        project_id,
        array(SELECT UNNEST(writers) EXCEPT SELECT UNNEST(owners)) AS writer_ids
    FROM project_access
) AS subquery
UNION
SELECT
    project_id,
    unnest(writer_ids) AS user_id,
    'writer' AS role
FROM (
    SELECT
        project_id,
        array(SELECT UNNEST(editors) EXCEPT SELECT UNNEST(array_cat(writers, owners))) AS writer_ids
    FROM project_access
) AS subquery) unioned
;

Another problem shoukd be with results of query, where multiple non unique users ids is returned.

do we want to use intarray extension?