fix: allow group members to read group information (#14200)

* - allow group members to read basic Group info
- allow group members to see they are part of the group, but not see that information about other members
- add a GetGroupMembersCountByGroupID SQL query, which allows group members to see members count without revealing other information about the members
- add the group_members_expanded db view
- rewrite group member queries to use the group_members_expanded view
- add the RBAC ResourceGroupMember and add it to relevant roles
- rewrite GetGroupMembersByGroupID permission checks
- make the GroupMember type contain all user fields
- fix type issues coming from replacing User with GroupMember in group member queries
- add the MemberTotalCount field to codersdk.Group
- display `group.total_member_count` instead of `group.members.length` on the account page

coderd/database/migrations/000242_group_members_view.down.sql

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+DROP VIEW group_members_expanded;

coderd/database/migrations/000242_group_members_view.up.sql

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+CREATE VIEW
+    group_members_expanded
+AS
+-- If the group is a user made group, then we need to check the group_members table.
+-- If it is the "Everyone" group, then we need to check the organization_members table.
+WITH all_members AS (
+    SELECT user_id, group_id FROM group_members
+    UNION
+    SELECT user_id, organization_id AS group_id FROM organization_members
+)
+SELECT
+    users.id AS user_id,
+    users.email AS user_email,
+    users.username AS user_username,
+    users.hashed_password AS user_hashed_password,
+    users.created_at AS user_created_at,
+    users.updated_at AS user_updated_at,
+    users.status AS user_status,
+    users.rbac_roles AS user_rbac_roles,
+    users.login_type AS user_login_type,
+    users.avatar_url AS user_avatar_url,
+    users.deleted AS user_deleted,
+    users.last_seen_at AS user_last_seen_at,
+    users.quiet_hours_schedule AS user_quiet_hours_schedule,
+    users.theme_preference AS user_theme_preference,
+    users.name AS user_name,
+    users.github_com_user_id AS user_github_com_user_id,
+    groups.organization_id AS organization_id,
+    groups.name AS group_name,
+    all_members.group_id AS group_id
+FROM
+    all_members
+JOIN
+    users ON users.id = all_members.user_id
+JOIN
+    groups ON groups.id = all_members.group_id
+WHERE
+    users.deleted = 'false';
+
+COMMENT ON VIEW group_members_expanded IS 'Joins group members with user information, organization ID, group name. Includes both regular group members and organization members (as part of the "Everyone" group).';