Move AuthTag and EncryptedData from the common.rs to the Keylime library

[ansasaki]

Move the EncryptedData and AuthTag structures from common.rs into the keylime library.

This is to continue the effort to move the code that can be shared from the keylime-agent application to the keylime library

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.48%. Comparing base (5bcce7e) to head (e51ae56).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
keylime/src/crypto/encrypted_data.rs	88.88%	1 Missing ⚠️

Additional details and impacted files

Flag	Coverage Δ
e2e-testsuite	63.48% <94.11%> (+0.06%)	⬆️
upstream-unit-tests	63.48% <94.11%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
keylime-agent/src/common.rs	64.42% <ø> (-1.71%)	⬇️
keylime-agent/src/keys_handler.rs	65.71% <ø> (+0.25%)	⬆️
keylime-agent/src/payloads.rs	83.90% <ø> (ø)
keylime/src/crypto.rs	67.23% <ø> (ø)
keylime/src/crypto/auth_tag.rs	100.00% <100.00%> (ø)
keylime/src/crypto/encrypted_data.rs	88.88% <88.88%> (ø)

... and 1 file with indirect coverage changes

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[sergio-correia]

LGTM