Enshrined token and bridge for ITN

[just-mitch]

There will be an enshrined gas paying token on L2, and an enshrined 1-way bridge from L1 to L2.
The enshrined gas token will have no functionality beyond being a token that can be used to pay for gas on L2.

Tasks

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1. Automatically deploy gas token in end-to-end tests #4801
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2. Deploy gas token as part of sandbox bootstrap #5022
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3. Investigate stable canonical gas token address #5024
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4. Validate fee payer authorized tx #5545
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