Add tpm2_get_capability_handle() to query if a "TPM handle" (meaning, a location/address in TPM storage) is populated in the TPM, and tpm2_get_capability_handles() to query for a specific number of handles. Add tpm2_esys_handle_from_tpm_handle() to create an "esys handle" (an opaque reference for use with the TPM EAPI that represents a TPM handle address) for an existing TPM handle. Since the TPM handle already exists in the TPM, this also also requires updating the cleanup code for Tpm2Handle objects to close the object (free its resources only from the EAPI code, but leave the handle in the TPM) instead of flush the object (which frees its EAPI resources and removes it from the TPM).
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