* feat(ctb): Enforce maximum L2 gas limit

Enforces a maximum L2 gas limit within the `SystemConfig`. This change
helps ensure that OP Stack chain governors keep the L2 block gas limit
within a reasonable range in order to guarantee that the L2 blocks may
be proven.

* In the `_setResourceConfig` function, the new minimum gas limit is
checked to be less than the current `gasLimit`. This value may never be
larger than `MAX_GAS_LIMIT`, per the checks in `_setGasLimit`. This
ensures that the `minimumGasLimit <= maximumGasLimit`

* Update SystemConfig.t.sol
Co-authored-by: Matt Solomon <matt@mattsolomon.dev>

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Co-authored-by: Matt Solomon <matt@mattsolomon.dev>