op-service: new bgpo module

[nonsense]

This PR is adding a BlobGasPriceOracle, similar to the GasPriceOracle in go-ethereum.

This oracle makes a newHeads subscription, and processes all new blocks and headers and builds an in-memory cache of blob prices, so that it can suggest competitive blob fee cap values to the transaction manager.

Fixes: #18102

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.58%. Comparing base (8243561) to head (cd564f4).

❗ There is a different number of reports uploaded between BASE (8243561) and HEAD (cd564f4). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (8243561)	HEAD (cd564f4)
cannon-go-tests-64	5	1
contracts-bedrock-tests	5	0

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #18386      +/-   ##
===========================================
- Coverage    75.20%   66.58%   -8.63%     
===========================================
  Files          187       55     -132     
  Lines        11197     4031    -7166     
===========================================
- Hits          8421     2684    -5737     
+ Misses        2630     1203    -1427     
+ Partials       146      144       -2     

Flag	Coverage Δ
cannon-go-tests-64	66.58% <ø> (-0.82%)	⬇️
contracts-bedrock-tests	?

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