feat(repo): introduce txmgr package

[davidtaikocha]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 73.38710% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 48.97%. Comparing base (6fe4dda) to head (644b751).

Files	Patch %	Lines
proposer/transaction_builder/blob.go	7.14%	13 Missing ⚠️
proposer/proposer.go	60.00%	3 Missing and 3 partials ⚠️
prover/proof_submitter/transaction/builder.go	77.77%	3 Missing and 1 partial ⚠️
bindings/encoding/input.go	0.00%	2 Missing and 1 partial ⚠️
prover/init.go	77.77%	1 Missing and 1 partial ⚠️
prover/proof_submitter/transaction/sender.go	75.00%	1 Missing and 1 partial ⚠️
prover/prover.go	80.00%	0 Missing and 2 partials ⚠️
pkg/rpc/beaconclient.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #658      +/-   ##
==========================================
- Coverage   50.12%   48.97%   -1.15%     
==========================================
  Files          58       55       -3     
  Lines        6057     5372     -685     
==========================================
- Hits         3036     2631     -405     
+ Misses       2688     2458     -230     
+ Partials      333      283      -50     

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