go: update to urfave v2, merge endpoint-monitor and op-heartbeat into main go module

[protolambda]

Description

• Merge endpoint-monitor into root Go module
  • Updated to no longer depend on legacy l2geth.
• Merge op-heartbeat into root Go module
• Update all main Go-mod packages to urfave CLI v2.
  • op-batcher
  • op-bootnode
  • op-challenger
  • op-heartbeat
  • op-node
  • op-program/host
  • op-proposer
  • op-service
  • op-signer/client
  • op-wheel

Cannon + Geth are already using urfave CLI v2.

With this upgrade, in separate later PRs, we can improve op-service without complicating a later v2 migration, and utilize the improved context/shutdown functionality of urfave CLI v2.

In practice, most of the v2 CLI migration changes are:

• commands/flags now with pointers
• EnvVars instead of EnvVar
• import-path updates

Tests

No functionality changes

Metadata

Fix CLI-3946

[changeset-bot]

⚠️ No Changeset found

Latest commit: d6f5695

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[trianglesphere]

I think the flipped CheckRequired is the reason the tests are failing.
Lots of code to review, but it was pretty straightforwards.

[tynes]

Generally looks good to me

[codecov]

Codecov Report

Merging #6098 (f25b2d8) into develop (eba6605) will increase coverage by 0.73%.
The diff coverage is 59.00%.

❗ Current head f25b2d8 differs from pull request most recent head d6f5695. Consider uploading reports for the commit d6f5695 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6098      +/-   ##
===========================================
+ Coverage    44.72%   45.46%   +0.73%     
===========================================
  Files          304      434     +130     
  Lines        23290    28002    +4712     
  Branches         0      688     +688     
===========================================
+ Hits         10417    12731    +2314     
- Misses       11914    14237    +2323     
- Partials       959     1034      +75     

Flag	Coverage Δ
bedrock-go-tests	44.67% <59.00%> (-0.06%)	⬇️
cannon-go-tests	61.71% <ø> (?)
common-ts-tests	26.82% <ø> (?)
contracts-bedrock-tests	59.25% <ø> (?)
core-utils-tests	48.47% <ø> (?)
fault-detector-tests	29.51% <ø> (?)
sdk-tests	39.83% <ø> (?)

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

Impacted Files	Coverage Δ
op-batcher/batcher/batch_submitter.go	0.00% <ø> (ø)
op-batcher/batcher/config.go	0.00% <0.00%> (ø)
op-batcher/cmd/doc/cmd.go	0.00% <ø> (ø)
op-batcher/cmd/main.go	0.00% <0.00%> (ø)
op-challenger/cmd/main.go	12.50% <0.00%> (ø)
op-challenger/cmd/watch/cmd.go	0.00% <ø> (ø)
op-challenger/config/config.go	36.36% <0.00%> (ø)
op-challenger/config/logging.go	0.00% <ø> (ø)
op-node/cmd/batch_decoder/main.go	0.00% <0.00%> (ø)
op-node/cmd/doc/cmd.go	0.00% <ø> (ø)
... and 28 more

... and 137 files with indirect coverage changes

[mergify]

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[mergify]

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[mergify]

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