CLI flag for "semi-supernode"

[coincashew]

Is your feature request related to a problem? Please describe.
A flag to custody half the columns, which allows for reconstruction

Possible names 🤣

--semi-supernode?
--halfnode
--midnode
--half-supernode
--slimnode

Describe the solution you'd like
Run in minimal reconstruction mode. This node will subscribe to and custody half of the data columns (enough for reconstruction), enabling efficient data availability with lower bandwidth and storage requirements compared to a supernode, while still supporting full blob reconstruction."

Additional context
Lighthouse example: sigp/lighthouse#8218
Prysm: to implement the “light super node” feature to help with blob retrieval for L2s