Represents a UTF-8 encoded string for FFI purposes.
This is equivalent to a CppArray as it is
#[repr(transparent)], but with the additional
constraint that the contents of the array
is a valid UTF-8 string.
Constructs a CPPLogsMessage from the provided bytes, assuming the bytes
are in the format specified as in the [log encoding], and come from
an Archivist LogStream with moniker, URL, and dropped logs output enabled.
[log encoding] https://fuchsia.dev/fuchsia-src/development/logs/encodings