op-node: Add RPC api to retrieve the current dependency set config

[ajsutton]

Description

Adds an RPC API to op-node to return the dependency set config if one is set. This is a parallel to the optimism_rollupConfig API.

RollupClient has been updated to support calling it.

Metadata

#16041 - required in order for the test-sequencer to fetch the full config.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.24%. Comparing base (2c81b2f) to head (e3382e6).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #16117       +/-   ##
============================================
+ Coverage    47.07%   96.24%   +49.17%     
============================================
  Files         1370      106     -1264     
  Lines       110191     4575   -105616     
============================================
- Hits         51867     4403    -47464     
+ Misses       54656      172    -54484     
+ Partials      3668        0     -3668     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	96.24% <ø> (ø)

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see 1264 files with indirect coverage changes

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