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chore: Rework how artifact download is handled

In order to avoid passing many callbacks around as arguments and
calling the update module's callback 9 levels of nesting deep, we
just call the particular functions directly wherever
possible. This requires a separate code path tailored to artifact
download.

We introduce mender-artifact-download.c providing
`mender_download_artifact()` as a new top-level function for
downloading an artifact from a given URI, extending deployment
data with information from it and selecting the update module for
the artifact.

Then there's a platform-specific (or rather HTTP-backed-specific)
`mender_http_artifact_download()` which uses callbacks specific
to artifact download not generic HTTP response handling that call
platform-independent `mender_download_artifact_callback()` which
goes to the code from mender-artifact.c where the actual artifact
data processing happens.

By moving the code from the mender_client.c function
`mender_client_download_artifact_callback()` into the
`process_artifact_data_callback()` function in mender-artifact.c
we isolate the artifact data processing to mender-artifact.c
where it belongs.

Ticket: MEN-7499
Changelog: none
Signed-off-by: Vratislav Podzimek <vratislav.podzimek@northern.tech>

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