async: fdio: remove unused member

clang warns about an unused private field ('fd') because it is
a capture-only member. There isn't any reason to keep the fd
around once the underlying sd_event has

async: fdio: remove unused member

clang warns about an unused private field ('fd') because it is
a capture-only member. There isn't any reason to keep the fd
around once the underlying sd_event has been created, so remove
it as a member.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I176b2c4b53bbd7e4bb4bc9a9594f5816ee1bda2e

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add async fd sender receiver for coroutines

Add async sender receiver for file descriptor based events. The user of
the async file descriptor needs to initialize a fdio instance and then
call next()

add async fd sender receiver for coroutines

Add async sender receiver for file descriptor based events. The user of
the async file descriptor needs to initialize a fdio instance and then
call next() to get each new event for the fd.

Tested:
```
> meson test -C builddir test_async_fdio
ninja: Entering directory `/host/repos/sdbusplus/builddir'
ninja: no work to do.
1/1 test_async_fdio OK 6.01s

Ok: 1
Expected Fail: 0
Fail: 0
Unexpected Pass: 0
Skipped: 0
Timeout: 0

Full log written to /host/repos/sdbusplus/builddir/meson-logs/testlog.txt
```

Change-Id: I1b4f16963e6096f30484c4a6df471e64ed24448b
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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