Quote parameter encoding format for entropy-test-cli

[HCastano]

In #1123 we added a requirement for certain extrinsics to have a TDX quote attached.
Additionally, a few extra fields such as a PCK certificate chain were also added.

The test-cli was updated to include these extra parameters but not a lot of care was
taken to figure out what the best format for these to be in was (right now they're mostly
just Strings). Peg had some suggestions, such as hex for the quote and PEM encoding
the PCK chain.

It's a little hard to know what the best way to pass these in to the test-cli is
because we don't have any programatic way to get these fields at the moment. This would
be a pre-requisite before properly tackling this issue.