op-supervisor: add API for Failsafe mode (part of AutoStop)

[axelKingsley]

What

Implements basic API for AutoStop:

• Get and Set Admin API
• Held as a simple atomic.Bool
• Whenever CheckAccessList is called, isAutoStop is checked and may short circuit the function to return ErrAutoStop
• Flags and Config included to set auto-stop as enabled on startup (for safety during operations which may include a reboot of the supervisor)

ProxyD and Geth may both call the GetAutoStop API to control their own rejection logic. Meanwhile, operators and metrics can use SetAutoStop to control the behavior.

Still to come (after this PR):

• Monitoring hooks for AutoStop
• AutoStop enablement when a Block Invalidation happens

Testing

New unit tests confirming:

• Use of the config for initial values
• Functional Get/Set
• Blocking of CheckAccessList only when enabled

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (87d8c73) to head (fe13c77).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #16582       +/-   ##
============================================
- Coverage    81.96%        0   -81.97%     
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  Files          161        0      -161     
  Lines         9304        0     -9304     
============================================
- Hits          7626        0     -7626     
+ Misses        1519        0     -1519     
+ Partials       159        0      -159     

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[geoknee]

LGTM