Function getFanoutGpaBuilder

Returns GpaBuilder<Fanout, {
    accountKey: PublicKey<string>;
    accountOwnerBumpSeed: number;
    authority: PublicKey<string>;
    bumpSeed: number;
    discriminator: number[];
    lastSnapshotAmount: number | bigint;
    membershipMint: OptionOrNullable<PublicKey<string>>;
    membershipModel: MembershipModel;
    name: string;
    totalAvailableShares: number | bigint;
    totalInflow: number | bigint;
    totalMembers: number | bigint;
    totalShares: number | bigint;
    totalStakedShares: OptionOrNullable<number | bigint>;
}>