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Viewer should be able to stream in .rrd files whilst they're still being written to #4056

@teh-cmc

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@teh-cmc

We can log to files in a streaming fashion already today:

import rerun as rr
import time

rr.init("rerun_example_points3d_simple")
rr.save("/tmp/stream.rrd")

for i in range(0, 100000):
    rr.set_time_sequence("frame", i)
    rr.log("points", rr.TextLog(f"frame {i}"))
    time.sleep(0.2)

That's great, but we cannot visualize file recordings in a streaming fashion:

$ rerun /tmp/stream.rrd  # will only show what it is there _right now_

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user-requestThis is a pressing issue for one of our users📺 re_vieweraffects re_viewer itself🧑‍💻 dev experiencedeveloper experience (excluding CI)

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