[MEX-961] enable proto-loader arrays

[claudiulataretu]

Reasoning

• both client and server proto will deserialize empty arrays in [] instead of undefined

Proposed Changes

• update handlers to use empty arrays instead of undefined
• remove unnecessary formatters from proto undefined deserialization

How to test

query GetDualYieldRewardsForPosition {
    getDualYieldRewardsForPosition(proxyStakingPositions: {
        farmsPositions: []
    }) {
        stakingRewards {
            rewards
        }
        farmRewards {
            rewards
        }
    }
}

• query should return an empty array instead of error

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.65%. Comparing base (01132ca) to head (2dc8d7e).
⚠️ Report is 3 commits behind head on feat/state-rpc.

Files with missing lines	Patch %	Lines
src/modules/state/services/pairs.state.service.ts	0.00%	10 Missing ⚠️
...rc/modules/state/services/staking.state.service.ts	0.00%	5 Missing ⚠️
src/modules/state/utils/state.format.utils.ts	42.85%	4 Missing ⚠️
src/modules/state/services/farms.state.service.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           feat/state-rpc    #1741      +/-   ##
==================================================
+ Coverage           53.42%   53.65%   +0.22%     
==================================================
  Files                 300      300              
  Lines               14330    14268      -62     
  Branches             1916     1875      -41     
==================================================
- Hits                 7656     7655       -1     
+ Misses               6668     6607      -61     
  Partials                6        6              

Flag	Coverage Δ
unittests	53.65% <12.50%> (+0.22%)	⬆️

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