[Pushers N01] Redundant Getters

[pepebndc]

Throughout the codebase, multiple instances of redundant getter functions were identified, where an external function had been exposed to read the value of a private state variable:

_l1ScrollMessenger within ScrollPusher
_lineaRollup within LineaPusher
_zkSyncDiamond within ZkSyncPusher
_pusher within ScrollBuffer
_pusher within LineaBuffer
_pusher within ZkSyncBuffer
_newestBlockNumber within BaseBuffer
Consider removing public getter functions and instead setting the state variables to public, clarifying intent and simplifying the codebase.

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• Create PR with unit tests
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