feat(op-service): Move Tx Creation to the txmgr

[refcell]

Description

Fixes CLI-3548

Moves transaction creation to the txmgr in the op-service. Rational is that there are two primary places where txs are sent - the op-proposer and op-batcher. In each, we currently have to role our own transaction construction since the op-service doesn't support creation. This is a generalized solution to tx creation in the txmgr.

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Latest commit: be704d5

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[mergify]

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

[trianglesphere]

The file op-batcher/batcher/txmgr.go should also be removed.

[sebastianst]

Looking good, just some minor comments.

Would also like to see CraftTx be done inside Send and removed from the interface, but not sure how much this would blow up the pr.

[codecov]

Codecov Report

Merging #5191 (eb591ae) into develop (84fda21) will increase coverage by 0.25%.
The diff coverage is 51.25%.

❗ Current head eb591ae differs from pull request most recent head be704d5. Consider uploading reports for the commit be704d5 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5191      +/-   ##
===========================================
+ Coverage    36.28%   36.53%   +0.25%     
===========================================
  Files          218      217       -1     
  Lines        19127    19024     -103     
===========================================
+ Hits          6940     6951      +11     
+ Misses       11514    11381     -133     
- Partials       673      692      +19     

Flag	Coverage Δ
bedrock-go-tests	36.53% <51.25%> (+0.25%)	⬆️

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

Impacted Files	Coverage Δ
op-batcher/batcher/config.go	0.00% <0.00%> (ø)
op-batcher/flags/flags.go	100.00% <ø> (ø)
op-batcher/batcher/driver.go	5.34% <46.66%> (+5.34%)	⬆️
op-service/txmgr/mocks/TxManager.go	47.82% <47.82%> (ø)
op-service/txmgr/txmgr.go	81.59% <67.64%> (-4.32%)	⬇️

... and 25 files with indirect coverage changes

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

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