op-node: Add admin_sequencerActive RPC method

[ajsutton]

Description

Add admin_sequencerActive RPC method.

Returns true if the node is actively sequencing, otherwise false. This is essentially a parallel with the eth_mining API from execution clients.

Tests

Updated e2e tests for admin API to cover the new endpoint.

Metadata

• Fixes https://linear.app/optimism/issue/CLI-4160/rpc-to-get-current-sequencer-state

[changeset-bot]

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Latest commit: bff6bab

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[codecov]

Codecov Report

Merging #6190 (bff6bab) into develop (ff6d298) will decrease coverage by 1.15%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6190      +/-   ##
===========================================
- Coverage    44.69%   43.54%   -1.15%     
===========================================
  Files          448      317     -131     
  Lines        29384    24646    -4738     
  Branches       691        0     -691     
===========================================
- Hits         13132    10733    -2399     
+ Misses       15182    12921    -2261     
+ Partials      1070      992      -78     

Flag	Coverage Δ
bedrock-go-tests	43.54% <0.00%> (-0.05%)	⬇️
cannon-go-tests	?
common-ts-tests	?
contracts-bedrock-tests	?
core-utils-tests	?
fault-detector-tests	?
sdk-next-tests	?
sdk-tests	?

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

Impacted Files	Coverage Δ
op-node/node/api.go	40.74% <0.00%> (-2.12%)	⬇️
op-node/rollup/driver/driver.go	0.00% <0.00%> (ø)
op-node/rollup/driver/state.go	0.00% <0.00%> (ø)
op-node/sources/rollupclient.go	0.00% <0.00%> (ø)

... and 131 files with indirect coverage changes

[trianglesphere]

LGTM

[mergify]

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[mergify]

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