net: add {Tcp, Unix}Stream::try_{read, write}_vectored
#3761
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Motivation
try_read
andtry_write
on these two types already exist, so it makes sense to add their vectored I/O counterparts. I needed this when implementing vectored writes on a shared TCP stream type (which makes use ofwritable
/try_write
instead of theAsyncWrite
implementation).Solution
Add these methods.