feat(protocol): change statevariables to return a struct

[cyberhorsey]

Callign getStateVariables is not very flexible. If we change the order, or add or remove parameters, existing code that uses properties by array index will break. WE see this happen as we move from our current testnet to our new one. It is also not readable for a consumer.

This change removes the array and returns a struct.

Change is OK for Merge but before deploy, taiko-client needs a relevant PR to stop destructuring the array into its own struct, but isntead update the bindings and use this struct directly.

[codecov]

Codecov Report

Merging #13113 (4d8f408) into main (91a8fe5) will increase coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main   #13113      +/-   ##
==========================================
+ Coverage   62.66%   62.71%   +0.05%     
==========================================
  Files         113      113              
  Lines        3217     3208       -9     
  Branches      436      436              
==========================================
- Hits         2016     2012       -4     
+ Misses       1124     1120       -4     
+ Partials       77       76       -1     

Flag	Coverage Δ		*Carryforward flag
bridge-ui	92.61% <ø> (ø)		Carriedforward from 91a8fe5
protocol	53.14% <0.00%> (-0.07%)	⬇️
relayer	69.10% <0.00%> (+0.17%)	⬆️
ui	100.00% <ø> (ø)		Carriedforward from 91a8fe5

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
packages/protocol/contracts/L1/TaikoL1.sol	32.69% <ø> (ø)
packages/protocol/contracts/L1/libs/LibUtils.sol	31.57% <0.00%> (+4.30%)	⬆️
...er/indexer/set_initial_processing_block_by_mode.go	80.00% <0.00%> (ø)
...es/protocol/contracts/thirdparty/LibMerkleTrie.sol	83.13% <0.00%> (-7.23%)	⬇️
packages/relayer/http/server.go	95.89% <0.00%> (+2.73%)	⬆️

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