Rename AToken/BToken to ALCA/ALCB

[keirongulrajani]

Scope

• Renamed AToken > ALCA
• Renamed BToken > ALCB
• Refactored interfaces for a/b tokens to staking/utility for improved clarity/maintenance

Why?

MP-728

Todos

If any, what are the follow-up tasks required other than merging this PR? Have they been arranged?

• ???

[codecov]

Codecov Report

Merging #156 (29bbaaa) into main (a877bc0) will increase coverage by 2.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   48.58%   50.73%   +2.15%     
==========================================
  Files         281      281              
  Lines       40900    40900              
==========================================
+ Hits        19871    20751     +880     
+ Misses      18736    17764     -972     
- Partials     2293     2385      +92     

Impacted Files	Coverage Δ
badgerTrie/smt_merkle_proof.go	69.53% <0.00%> (+3.90%)	⬆️
utils/shared.go	58.62% <0.00%> (+5.17%)	⬆️
constants/dbprefix/layer1.go	33.33% <0.00%> (+16.66%)	⬆️
layer1/ethereum/ethereum.go	42.68% <0.00%> (+42.68%)	⬆️
layer1/transaction/worker_pool.go	44.44% <0.00%> (+44.44%)	⬆️
layer1/tests/hardhat.go	53.35% <0.00%> (+53.35%)	⬆️
layer1/transaction/backend.go	60.34% <0.00%> (+59.47%)	⬆️
layer1/tests/setup.go	60.35% <0.00%> (+60.35%)	⬆️
layer1/transaction/transaction.go	69.64% <0.00%> (+69.64%)	⬆️

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