Implement tpm2_duplicate

FR to implement `tpm2_duplicate` capability which will allow sealed transfer of tpm based keys

Here is a sequence using `tpm2_tools`: [Duplicating Objects](https://github.com/salrashid123/tpm2/tree/master/tpm2_duplicate)

for ref, the

  -  `TPM2_CC_Duplicate` constant value is   `0x14b` from tpm2_tools [command-code-,mappings](https://github.com/tpm2-software/tpm2-tools/blob/master/man/tpm2_policycommandcode.1.md#command-code-mappings) for [constants.go](https://github.com/google/go-tpm/blob/master/tpm2/constants.go#L349)

but the larger thing that remains is implementing [tpm2_duplicate](https://github.com/tpm2-software/tpm2-tools/blob/master/man/tpm2_duplicate.1.md)

eg

```
tpm2_duplicate -C new_parent.ctx -c key.ctx -G null -p "session:session.dat" -r dup.dup -s dup.seed
```

Start with constants.go and the referenced tpm2_tools Duplicating Objects sequence, then read the tpm2_duplicate command documentation and its TPM2_CC_Duplicate mapping. Compare the requested command invocation with the existing go-tpm APIs and determine the supported inputs and outputs. Done means the tpm2_duplicate capability is implemented for sealed transfer of TPM-based keys.

Written by the indexing model from the issue text.