op-node: Metrics in the channel bank

[trianglesphere]

Description

This adds 3 new metrics to channel bank:

1. New Head Channel Event
2. Channel Timed Out Event
3. Frame Added Event

The new channel head event is the most complex. It indicates that there is new
channel in the ready position of the channel bank. It does not indicate if the
channel is ready to be read from. It is complicated to implement because we
have several ways of removing channels which would mean that a new channel becomes
the head channel.

The channel timeout & frame added events are much simpler.

The intention is to make it easier to determine if the head channel in the channel
bank is not progressing.

Metadata

• Fixes CLI-4321

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Latest commit: 48d4d3c

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[mergify]

Hey @trianglesphere! This PR has merge conflicts. Please fix them before continuing review.

[codecov]

Codecov Report

Merging #6708 (5f12865) into develop (d3f4ec8) will increase coverage by 2.98%.
The diff coverage is 39.39%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6708      +/-   ##
===========================================
+ Coverage    44.77%   47.76%   +2.98%     
===========================================
  Files          375      307      -68     
  Lines        29474    23293    -6181     
  Branches      1692        0    -1692     
===========================================
- Hits         13198    11126    -2072     
+ Misses       14836    11156    -3680     
+ Partials      1440     1011     -429     

Flag	Coverage Δ
bedrock-go-tests	47.76% <39.39%> (-0.04%)	⬇️
cannon-go-tests	?
chain-mon-tests	?
common-ts-tests	?
contracts-bedrock-tests	∅ <ø> (∅)
contracts-ts-tests	?
core-utils-tests	?
sdk-next-tests	?
sdk-tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
op-node/rollup/derive/pipeline.go	0.00% <0.00%> (ø)
op-node/rollup/driver/driver.go	0.00% <ø> (ø)
op-node/testutils/metrics.go	4.00% <0.00%> (-0.55%)	⬇️
op-node/metrics/metrics.go	3.49% <15.38%> (+0.30%)	⬆️
op-node/rollup/derive/channel_bank.go	70.37% <68.75%> (+0.15%)	⬆️

... and 77 files with indirect coverage changes

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[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.