add streaming messages and app identity req structures to enrollz_biz

[gh4683]

• Added all send and receive streaming messages for RotateAIKCert()
• Added more stubs for functions needed to implement this logic
• Added TPMIdentityRequest Structure (and dependent structures) to parse the application_identity_request bytes
• Added a basic test for RotateAIKCert()

[coveralls]

Pull Request Test Coverage Report for Build 16208374783

Details

• 130 of 209 (62.2%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+3.1%) to 45.11%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/biz/enrollz_biz.go	90	169	53.25%

Totals
Change from base Build 16207458523:	3.1%
Covered Lines:	881
Relevant Lines:	1953

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💛 - Coveralls

[wlanmac]

Would be great to also perhaps stub out a test for the new code.

[betuls]

The code is structured well, please rename biz_utils to a more specific one such as tpm12_utils or tpm12_structures or tpm12_parcers