Add support for RecordSpecification identifiers to the metadata address class.

[iramiller]

Summary

Add a new RecordSpecification type to the Address class.

Problem Definition

Add a new RecordSpecification identifier to the metadata class. Format should be

PrefixRecordSpecification = "recspec"
hrp = PrefixRecordSpecification
requiredLength = 1 + 16 + 32 // type byte plus size of one uuid and one sha256 hash

Should contain the ContractSpecification UUID along with the hash of the record name. Add an iterator prefix that returns the prefix portion of the id bytes (type byte + record specification uuid bytes). Ensure appropriate tests are added to address_test.go

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