HIP-904 Ensure Importer support for unlimited Max Automatic Token Associations

[edwin-greene]

Problem

Ensure support for unlimited Max Automatic Token Associations. Importer should already support them.

Solution

Add test(s) for the -1 value for maxAutomaticTokenAssociations in Importer. Protobuf version 0.51 is the first version that will use -1 to indicate unlimited max automatic token associations.

Alternatives

No response