[Platform/Seastone2] add CEL seastone2 platform and breakout configs #11619
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Why I did it
Add Seastone2 platform qos/optics related configs and port breakout support.
How I did it
Add port breakout related configurations according specifications.
How to verify it
Verify the port breakout config with breakout commands
Which release branch to backport (provide reason below if selected)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)