Add open for composed transcodingstreams

[jakobnissen]

This allows users to easily chain codecs using the do-syntax. Here is an example where the input is chained through four different streams.

julia> using CodecZlib, TranscodingStreams

julia> open(
           i -> first(read(i, String), 10),
           GzipDecompressorStream ∘ NoopStream ∘ GzipCompressorStream ∘ NoopStream,
           "Project.toml"
       )
"name = \"Tr"

[jakobnissen]

I'll add tests if anyone with the permission to merge gives me the thumbs-up :)

[ViralBShah]

@jakobnissen If helpful and if you are interested, I can give you commit access here.

[mkitti]

This still needs a test.

[ViralBShah]

This still needs a test.

Agree.