Refactor Staking Models and Create Parquet Stake Processor

[dermanyang]

Purpose

Leaving in Postgres lookups for delegator_balances in this parquet processor as there aren't sufficient staking transactions to have an impact on performance. Further, the logic is not possible to rewrite without them.

/delegator_pools models

• Refactor DelegatorPoolBalanceMetadata, PoolBalanceMetadata, DelegatorPoolBalance, CurrentDelegatorPoolBalance to use the postgres/common pattern.
• DelegatorPool left as-is as all fields are postgres and parquet compatible.

/current_delegated_voter

• Moved CurrentDelegatorVoter to db/common and left as-is as all fields are postgres and parquet compatible

/delegator_balances models

• Refactor CurrentDelegatorBalance, DelegatorBalance to use the postgres/common pattern.
• Moved CurrentDelegatorBalanceQuery to db/common/ but left as-is since we won't have lookups in parquet.

/delegator_activities models

• Refactor DelegatedStakingActivity to use the postgres/common pattern.

/staking_pool_voter models

• Moved CurrentStakingPoolVoter to db/common and left as-is as all fields are postgres and parquet compatible

`/proposal_voters models

• Refactor RawProposalVote to use common/postgres pattern.

Testing

TODOs

• Will migrate additional models as requested from Analytics team

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 480 lines in your changes missing coverage. Please review.

Project coverage is 47.6%. Comparing base (0cad206) to head (d7e434d).

Files with missing lines	Patch %	Lines
.../src/parquet_processors/parquet_stake_processor.rs	0.0%	111 Missing ⚠️
...parquet_stake_processor/parquet_stake_extractor.rs	0.0%	78 Missing ⚠️
...b/common/models/stake_models/delegator_balances.rs	86.6%	53 Missing ⚠️
rust/processor/src/processors/stake_processor.rs	60.3%	42 Missing ⚠️
.../models/stake_models/parquet_delegator_balances.rs	0.0%	41 Missing ⚠️
...common/models/stake_models/delegator_activities.rs	61.1%	28 Missing ⚠️
...c/db/common/models/stake_models/proposal_voters.rs	33.3%	22 Missing ⚠️
...db/postgres/models/stake_models/delegator_pools.rs	47.6%	22 Missing ⚠️
rust/sdk-processor/src/parquet_processors/mod.rs	0.0%	20 Missing ⚠️
...odels/stake_models/parquet_delegator_activities.rs	0.0%	19 Missing ⚠️
... and 5 more

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #647     +/-   ##
=======================================
- Coverage   48.0%   47.6%   -0.4%     
=======================================
  Files        232     242     +10     
  Lines      27159   27656    +497     
=======================================
+ Hits       13055   13187    +132     
- Misses     14104   14469    +365     

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