Change method of receiving Caddisfly images

[nhternup]

See also: #1692 and akvo/akvo-caddisfly/issues/254

Currently flow receives Caddisfly images via the external folder created by Caddisfly app.
As of Android API 30 It is not possible anymore to access external folders or folders of other apps.

Possible Solution:
One method is to return images as byte array in the result intent back to Flow from Caddisfly

[stale]

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