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[FIX] Prevent FS write from draining Resources content

Previously, when writing to an FS-Adapter, a Resources content stream
would be drained, making it impossible to access a Resources content
again.

With this change, by default a Resources content will be buffered while
draining its content stream.

An optional 'drain' parameter can be supplied to skip buffering to lower
the memory demand of the operation in cases where further access to the
resource content is not required.

Alternatively, an optional 'readOnly' parameter can be supplied to skip
buffering and instead create a new readable stream of the written file.
The file will be written with '444' (read only) permissions. This can
also help reducing memory usage.

Add a pessimistic check for drained content streams.

Refactor FS- and memory adapter unit tests.

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