Bug: iOS library prevents creating one-person groups, which should be allowed

[bwcDvorak]

Describe the bug

Bug was reported in this comment about a different issue.

Creating a group where the creator is the only member is allowed, but our iOS library prevents doing so.

There is a guard against creating empty groups in the ios lib

xmtp-ios/Sources/XMTPiOS/Conversations.swift

Lines 118 to 129 in 895fb78

	public func newGroup(with addresses: [String], permissions: GroupPermissions = .everyoneIsAdmin) async throws -> Group {
	guard let v3Client = client.v3Client else {
	throw GroupError.alphaMLSNotEnabled
	}
	if addresses.isEmpty {
	throw GroupError.emptyCreation
	}
	if addresses.first(where: { $0.lowercased() == client.address.lowercased() }) != nil {
	throw GroupError.memberCannotBeSelf
	}

xmtp-ios/Sources/XMTPiOS/Conversations.swift

Lines 19 to 38 in 895fb78

	public enum GroupError: Error, CustomStringConvertible {
	case alphaMLSNotEnabled, emptyCreation, memberCannotBeSelf, memberNotRegistered([String]), groupsRequireMessagePassed, notSupportedByGroups
	public var description: String {
	switch self {
	case .alphaMLSNotEnabled:
	return "GroupError.alphaMLSNotEnabled"
	case .emptyCreation:
	return "GroupError.emptyCreation you cannot create an empty group"
	case .memberCannotBeSelf:
	return "GroupError.memberCannotBeSelf you cannot add yourself to a group"
	case .memberNotRegistered(let array):
	return "GroupError.memberNotRegistered members not registered: \(array.joined(separator: ", "))"
	case .groupsRequireMessagePassed:
	return "GroupError.groupsRequireMessagePassed you cannot call this method without passing a message instead of an envelope"
	case .notSupportedByGroups:
	return "GroupError.notSupportedByGroups this method is not supported by groups"
	}
	}
	}

Expected behavior

Allow creation of creator-only groups.

Steps to reproduce the bug

No response