* Support empty strings and vectors in standard codec
Fixes#41993
Currently an empty string or vector will call through to WriteBytes
which asserts that the number of bytes it is being asked to write is
strictly positive. Instead we should not call WriteBytes if the length
is zero.
Similarly, when we read, we don't need to call out if the length is
zero.
* fix typo in test name
* remove unnecessary length check in ReadValue for List
* we also don't need this check before calling read as memcpy can handle size 0
Adds StandardMethodCodec support to the C++ client wrapper. This makes it
substantially easier to add Windows and Linux support for existing plugins, as
StandardMethodCodec is the default plugin protocol.
Fixesflutter/flutter#30670
Does not include extensibility for the codec, which will be added later.