[rllib] Move some inline defs to avoid deserialization errors #5228
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What do these changes do?
I'm still not sure why the definition order of these classes matter, or why the protobuf refactoring PR causes it to matter. However, this PR does empirically fix the IMPALA crashes when remote_worker_envs=True and the number of workers is overloaded on the machine.
Related issue number
Closes #5125
Linter
scripts/format.sh
to lint the changes in this PR.