op-node: Add Metrics

[trianglesphere]

Description

This adds one new metric, sequencer_active to report if the sequencer is active or not.

This also modifies transactions_sequenced_total. It is transformed from a Gauge (incorrectly called a counter previously) to a CounterVec. It is labelled with type where the value is l1_info_deposit, deposit, and txns to differentiate the different kinds of transactions.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.14%. Comparing base (6d36d68) to head (4b1f84f). Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12408      +/-   ##
===========================================
- Coverage    64.32%   64.14%   -0.19%     
===========================================
  Files           52       52              
  Lines         4348     4348              
===========================================
- Hits          2797     2789       -8     
- Misses        1376     1385       +9     
+ Partials       175      174       -1     

Flag	Coverage Δ
cannon-go-tests	64.14% <ø> (-0.19%)	:arrow_down:

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see 1 file with indirect coverage changes

[tynes]

These changes are generally good @trianglesphere, thank you. Left a few comments, curious what you think

[trianglesphere]

@tynes I cleaned up some of the logic to avoid duplicating code and simplified the deposit count. Ideally we'd be able to split out each type of txn, but having the deposit vs non deposit split already is a big step forward.

[protolambda]

/ci authorize 414e4fb540c1cb8df030123c83dcf48fb6d10c12

[protolambda]

/ci authorize 4a60f1bb59d79e83bff9f24703876b5074d9aaae