Does not further validate contents of an bstr with embedded .cbor or .cborseq

[rohanmahy]

Given CDDL like this, the validator just checks that foo is a bstr, but does not check that the bstr inside is a valid instance of bar.

[
foo: bstr .cbor bar
]

bar = {
a: text,
b: int,
c: bstr
}

[anweiss]

@rohanmahy this should be fixed. Re-open as needed.