Add missing initial group permissions

[saulmc]

• [x] Who can add other members ([default] Members -- Admins/Superadmins)
• [x] Who can edit group metadata ([default] Members -- Admins/Superadmins)
• [ ] Who can send messages ([default] Members -- Admins/Superadmins) - NOT DOING

[alexrisch]

This would need to be prioritized on the SDK level, right now all that can be offered is what the UI currently shows

[saulmc]

I thought this was enabled by XIP-47 -- what parts of that have/have not been implemented? /cc @cameronvoell

[nmalzieu]

We don’t have the same permissions settable during group creation than after creation

createGroup takes a single permissionLevel (which sets only the "who can add members" permission) while on an existing group we can update addMemberPermission, groupNamePermission etc separately.

Waiting for an answer on Slack from the SDK team.

Ideally we wait for that feature to be added in the SDK We could also create group then update its permissions immediately but could def be buggy

[nmalzieu]

Blocked by https://github.com/xmtp/libxmtp/issues/907

[cameronvoell]

heads up @nmalzieu @saulmc this should be included as of @xmtp/react-native-sdk version 2.1.0 and later. Tests here show how it works: https://github.com/xmtp/xmtp-react-native/blob/e436b7c7744132a3e9e808ee348779a2df237a9c/example/src/tests/groupPermissionsTests.ts#L521-L643

Basically a new conversations.newGroupCustomPermissions function. let me know if any q's! 🙏