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* event for NAT device type
Co-authored-by: Marten Seemann <martenseemann@gmail.com>

Co-authored-by: Yusef Napora <yusef@protocol.ai>

This saves us a bunch of error prone manual decode/encode logic.
Co-authored-by: Marten Seemann <martenseemann@gmail.com>

* add a context to MuxedConn.OpenStream

* add a context to Conn.NewStream

`SecureInbound` secures an inbound and not an outbound connection.

* add CloseRead/CloseWrite on streams

This changes the behavior of `Close` to behave as one would expect: it closes
the stream. The new methods, CloseWrite/CloseRead allow for closing the stream in
a single direction.

Note: This _does not_ implement CancelWrite/CancelRead as our stream muxer
_protocols_ don't support that.

fixes #9

* remove stream util helpers

FullClose and AwaitEOF were introduced to work around the fact that calling
Close on a stream only closed the write half. All users must adapt their code
to the new interfaces, so this change is intentionally breaking.

There was a typo in doc for `ProtocolID` alias

Co-authored-by: Aarsh Shah <aarshkshah1992@gmail.com>
Co-authored-by: Raúl Kripalani <raul@protocol.ai>

Interface to verify if a peer supports a protocol without making allocations.

feat: add a function to tell if a context subscribes to query events

This can save us some work if the caller doesn't actually care about these events.

fix: envelop contains a mutex and can't be copied.

fix: use correct reachability type