[lib] Update filterThreadPermissions to handle EDIT_THREAD_AVATAR

Summary:
We're going to exclude EDIT_THREAD_AVATAR permission from all clients for now. We'll add hasMinCodeVersion check once we have a native release with thread avatar editing enabled.

Depends on D7363 and shows how it can be extended to handle new permissions fairly easily.

Test Plan:

1. Set breakpoint before filter serverMember.permissions and see that it includes `EDIT_THREAD_AVATAR:

2. Set breakpoint after and see that memberPermissions is missing thread_edit_avatar permission:

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1. Set filterThreadEditAvatarPermission to false and ensure that edit_thread_avatar is included in threadInfos[123].members[456].permissions after logging on:

(second field from bottom)

2. Set filterThreadEditAvatarPermission back to true and ensure that edit_thread_avatar is not included in threadInfos[123].members[456].permissions after logging on:

Reviewers: ashoat, ginsu, rohan

Reviewed By: ashoat, rohan

Subscribers: rohan, tomek

Differential Revision: https://phab.comm.dev/D7364