This commit adds support for two operations, enabling key attestation
via the ActivateCredential call. A test has also been added to verify
attestation using the Endorsement Key.

Signed-off-by: Ionut Mihalcea <[email protected]>

Split up the setup for the attesting key into different methods so it's
clearer what is being done.

Signed-off-by: Ionut Mihalcea <[email protected]>

This commit expands the scope of the TransientKeyContextBuilder to
adding more than one hierarchy auth value. This is needed for attesting
keys with the default Endorsement Key which uses the Endorsement
Hierarchy for authorization by default.

Signed-off-by: Ionut Mihalcea <[email protected]>

* Changed the serialisation of the TPM2B_Public to use the marshaling
command
* Changed the MakeCredParams struct to be fully public to avoid needless
clones
* Factored out the code for obtaining the EK public key

Signed-off-by: Ionut Mihalcea <[email protected]>

Instead of serializing TPM2B_PUBLIC, use the embedded TPMT_PUBLIC
instead, as this is what the key name is computed over.

Signed-off-by: Ionut Mihalcea <[email protected]>

Adding more tests for the key attestation operations.

Signed-off-by: Ionut Mihalcea <[email protected]>

This commit fixes the conversion from `TPMT_PUBLIC` size to the input of
Tss2_MU_TPMT_PUBLIC_Marshal. A new WrapperErrorKind variant is added for
internal errors which were not expected (essentially as a replacement
for `unwrap`).

The cross-compilation script was also moved to run per-commit in the CI
instead of nightly - the fix above would've been obvious if we tried
cross-compilation.

Signed-off-by: Ionut Mihalcea <[email protected]>

Improved the tests to check for the exact response code expected.
Improved the documentation on `MakeCredentialParams` to detail what the
contents are meant for.

Signed-off-by: Ionut Mihalcea <[email protected]>

Signed-off-by: Ionut Mihalcea <[email protected]>